亚巡东海赛次轮提提帕冲破韩流领先 安秉勋退居T2

cs@fun88.com

2019-02-11

据英国《卫报》网站3月20日报道,包括上海和北京在内的中国富裕城市出产一些世界上数学成绩最好的小学生,而英国学生的排名远远落后于他们的亚洲同龄人。这其中包括不断增加社区定点医疗机构数量;统一社区和大医院医保药品报销范围;给予高血压、糖尿病、冠心病、脑血管病等4种慢性病患者,可享受2个月长处方报销便利;鼓励社区卫生机构开展居家上门医疗服务和建立家庭病床,发生的医疗费用医保均按规定予以报销等等。据何先生表示,当晚自己在凌晨4点左右醒来,下意识地操作手机时发现手机黑屏,随后他发现,自己的手机曾被一个陌生号码接管。

3月21日,记者从2017年南宁市“壮族三月三”系列活动发布会上获悉,3月20日至4月20日,南宁将在全市范围内开展“壮族三月三”系列活动,举办一系列具有民族性、区域性、群众性,集民族文化、群众体育、风情旅游、特色消费于一体的特色活动。其实,在第一百七十九条规定的民事责任承担方式中,就有“恢复原状”这一项,也就是说,可以要求破坏环境的人以恢复原状的方式承担民事责任。感恩的心随着针线跳动看着两个孩子病情基本稳定,阿依加玛丽想做点什么,她不想让自己的家庭日后一直是党和政府的负担。

16.保证厨房清洁。民政部党组成员、副部长高晓兵说,要抓紧组织殡葬服务单位全面深入开展安全隐患排查整治,制定完善祭扫安全保障方案预案,落实人防、物防、技防措施,加强祭扫高峰期殡葬服务场所人流监测预警分流、交通疏导和火源管控,配合开展野外祭扫用火检查,积极引导文明、低碳、错峰祭扫,严防踩踏、火灾等安全事故的发生,切实保障人民群众祭扫安全。对下季度,货币政策感受预期指数为41.3%,低于本季判断1.7个百分点。

6.每天5杯绿茶。库里说:从2013年以来我每年都去中国,中国球迷对NBA、勇士队和对我的支持令人难以置信。芦笋含有草酸,容易与钙结合形成草酸钙,所以吃前要用淡盐水煮5~10分钟,再在清水中浸泡一下,可去除大部分草酸和涩味。

因此,这件事情可能是电视连续剧的开头,后面还有若干集,也请大家关注。河北省体育局副局长田建功表示,河北足球有着辉煌的过去,深厚的基础,而青少年更是足球发展的未来,需要常抓不懈。这让列车可以达到每小时760英里(约合每小时1220公里)的时速,并且耗能极低。

  立善法于天下,则天下治。”  北青报记者从多个品牌4S店了解到,目前北京新能源车货源充足,基本都能保证现车提供。频繁被曝出食品卫生安全问题对于任何一个连锁餐饮品牌而言都是很严重的打击,更别说是计划上市的企业。

ThelatesthandovercomesamidtensionsfollowingSeoul"sdecisiontoinstalltheUS"TerminalHighAltitudeAreaDefenseanti-missilesystem,whichBeijingisfirmlyopposedto,andshouldserveasawake-upcalltothenewROKgovernmentthatthehard-wonBeijing-Seoulpartnershipmustevolveonthebasisoflearningfrompastmistakesratherthanrepeatingthem.ChinaandtheROKestablisheddiplomaticrelationsin1992,buryingtheirpost-KoreanWar"confrontation"thatlastednearlyfourdecades.Sincethen,thetwocountrieshaveenjoyedmorethantwodecadesofreciprocalexchangesandinteractionsuntilWashingtonandSeouldecidedtodeploytheTHAADontheROKsoillastyear,escalatingtensionsinNortheastAsia.TheremainsoftheChinesePeople"sVolunteerArmyareareminderofthecrueltyoftheKoreanWar.Atotalofaround197,000Chinesesoldiers,whofoughtintheKoreanWaragainsttheUS-ledforces,sacrificedandmostofthemwereburiedontheKoreanPeninsula,accordingtoreports.Butthepost-warlosseshavegonebeyondcasualties.Thewarwreakedhavoconlocalresourcesandresidents,dividingtheKoreanPeninsulaintotwocountriesthatarevehementlyopposedtoeachother.Peaceinitiativeshaveachievedlimitedprogressafterthe1953armisticeforalackoftrust.ThedefensetreatysignedbyWashingtonandSeoulallowstheUnitedStatesmilitarytobestationedintheROK,pushingtheDemocraticPeople"sRepublicofKoreafurtherawayfromthenegotiationtable.ThatChinaandtheROKmanagedtoupgradetheirrelationstoasatisfactorylevelinjustovertwodecades,ontheotherhand,highlightstheimportanceofstability.Thetwocountriessignedafreetradeagreementtwoyearsago,andChinahasbecometheROK"slargesttradingpartnerandexportdestination.Bytheendoflastyear,ChineseinvestmentintheROKhadalmostdoubledfromfiveyearsago.Culturalandgrassrootsexchanges,too,increasedsignificantlyoverthepastfewyears.ThecomplementarynatureoftheChineseandROKeconomieshasnotonlybroughtbenefitstothetwopeoples,butalsocontributedtoregionalstability.Andthankstotheirrespectforeachother"ssecurityconcernsandadherencetonegotiationsinhandlingtheKoreanPeninsulaissue,BeijingandSeoulforgedastrategicpartnership.ButSeoulrelinquishedthestrategicbalanceapproach;itagreedtodeployTHAADattheriskofestrangingitselffromBeijing,evenprovokingawarinNortheastAsia.TheROKdecision-makers,betheyfromthetransitionalteamorthenewadministrationtobeelectedinMay,shouldnotethatsanctioningtheDPRKhasnotstoppeditfromdevelopingnuclearweapons.GiventhattheUSadministrationunderPresidentDonaldTrumpmaybepreparingtotakeharshermeasures,itisaratherriskymoveforSeoultoexpeditetheinstallationofTHAAD,whichmanyevenintheROKareagainst.Besides,resortingtotheUSanti-missilebatteryfor"self-defense"istechnicallyquestionable,andriskssabotagingthestrategicinterestsofChinaandRussia.ThatishardlywhattheROKwantsfromit.TheauthorisanassociateresearcherattheNortheastAsiaStudiesInstituteatJilinAcademyofSocialSciences.刘延东等参加会见。运营商渠道对于手机厂商短暂提升销量有利,但难以上规模,联想频频引入运营商高管如果仅是为了回归运营商渠道,只能是治标不能治本。

中央电视台《新闻联播》播音员罗京、李瑞英宣读公约内容《公约》倡议,各缔约单位应共同遵守国家关于互联网文化建设和管理的法律、法规和政策,依法开展互联网视听节目服务,积极传播健康有益、符合社会主义道德规范、体现时代发展和社会进步、弘扬民族优秀文化传统的互联网视听节目,包括影视剧、动画片,共同抵制腐朽落后思想文化,不传播渲染暴力、色情、赌博、恐怖等危害未成年人身心健康、违背社会公德、损害民族优秀文化传统的互联网视听节目;应尊重和保护著作权人和互联网视听节目服务单位的合法权益,创造和维护公平有序的网络视听节目版权环境;应建立互联网视听节目信息的行业共享互助机制,保持信息的有效沟通,共同净化网上空间,形成共建共享的精神家园。张经喜(时任宁德地区纪委副书记):反应比较强烈,议论比较多,所以习书记下决心就把清房问题,作为惩治腐败的突破口来抓,亲自抓。通知还对住房公积金贷款条件进行了调整,将用公积金贷款购买首套房的首付款比例提升至30%,二套房首付比例提升至60%,停止向购买第三套及以上住房的家庭发放住房公积金贷款;同时,暂停受理住房公积金异地个人住房贷款。

二要进一步规范,按照《民航局行政审批标准化建设方案》要求,加快推进标准化建设进度,尽快落实统一编号、统一出具受理单等工作要求。今天我们的发布会,我想就是这样一个目的,请新闻界朋友们来,把这件事情弄清楚,这是一件什么事情?为什么要做这件事情?这件事情对中国文化产业、文化发展、文化“走出去”有什么意义?我们给大家准备了一些新闻背景资料,请同志们帮助我们进行宣传、解读。  根据东风本田官方消息,UR-V作为东风本田旗下最高级别的SUV车型,是东风本田多元化布局的又一力作,它的推出不仅引领了整个产品线的向上布局,也进一步拉升了东风本田的品牌形象。

  很多人可能认为精子的快速运动会对其周围流体产生随机的影响,使竞争精子更难以通过,但实际上在精子周围的流体中会可以看到良好的运动模式。,thetravelplanningandbookingwebsite,hasnamedBaliastheglobalwinnerofits2017TravelersChoiceAwardsfordestinations.Wereexcitedtorevealourcommunitysfavoritetraveldestinationsfor2017andrecognizetheseiconicplaceswithTravelersChoiceawards,saidBarbaraMessing,chiefmarketingofficerforTripAdvisorina.Awardwinnersweredeterminedusinganalgorithmthattookintoaccountthequantityandqualityofreviewsandratingsforhotels,restaurantsandattractionsacrossdestinationsworldwide,gatheredovera12-monthperiod.Theawardshonor418outstandingdestinationsin24listsacrosstheglobe.(Readalso:)NewYorkCity,meanwhile,ranksnumberoneintheUSfortheseventhconsecutiveyear.HereisthecompleteoftravelersdestinationchoiceaccordingtoTripAdvisor:至此,苹果在中国计划建立的研发中心数量已经有4个,其它两个分别位于北京和深圳。

  年初以来,季末流动性波动风险就备受关注。通知提出,对于购房时间的认定,以在当地房地产主管部门信息系统网签购房合同的时间为准,该规定将从3月22日起正式实施。有一瞬间,男孩似乎无法保持平衡,摇晃了一下,然后就跳到了阳台上。

  我国从2000年开始陆续启动了ARJ21项目和C919大型客机项目。  上市公司分红也是拼了。(3月21日新华网)南千岛群岛(日本称“北方四岛”)归属问题,是俄日关系发展和两国签署和平条约的主要障碍。

他当时说,我此次访澳目的是增进互信、深化合作、面向未来、共谋发展。”  王国彪说:“主观上我们绝对没有想搞价格歧视,客观上也不涉嫌价格歧视。  从北京往首尔的飞机上,人确实不多,可以搭载300人的空客330,实际上最多也就是上座50%。

标准本身提供了对动漫版权原数据信息的支持,有利于对动漫知识产权的保护。而事实上,网络文艺的现实发展一定程度上打破了传统的文学和其他艺术形式得以确立的作品、符号、门类的边界。总编辑王晓辉表示,中国网要发挥自身优势,结合新媒体特点,把握时效、突显交互、丰富内容、精准传播。

孙明说。尽管如此,有购房意愿的中国居民依然不少。如今,日本又想在南海搞出更大动静,有分析认为,这可能还意味着日本不甘于只在日美同盟中扮演从属角色,想为自身谋取更大的国际空间。

AjobseekerfillsupanapplicationformatajobfairinWenxiancounty,Henanprovince.[XuHongxing/ForChinaDaily]Astheeconomyhasenteredintoaphaseofre-balancingfromemergingtomoresustainableandinclusivegrowth,whichiscalledthenewnormal,theChineselabormarketmightalsobefacedwithnewchallenges.Totalpopulationoftheworkingagehasshownnegativegrowthsince2011,whichmeanssupplyanddemandtendstobemorebalanced.Thisnaturallyleadstolesscompetitionwithinthelabormarketingeneral,whilefocusneedstobeonsolvingproblemsofemploymentstructureandfrictionalunemployment.Frictionalunemploymentisanacademicdefinitionmeaningwhenworkersleavetheirjobstofindbetterones.It"susuallyavoluntaryexit,butcanalsooccurfromalayofforterminationwithcause.Thetime,effortandexpensesittakestheworkertofindanewjobiscalledfriction.Whilethisfrictionproblemmightbeamorecommondifficultyamongbothauthoritiesandemployees,withthedeepeningofreformandadjustmentofeconomicstructureprocessingcomprehensively,attentionisneededrelatingtothreeaspectsofemploymentcontradiction:First,withthestructuralreformcontinuing,dealingwithover-capacityindustriesandshuttingdownzombiecompaniesnaturallyleadstoproblemsofstructuralandfrictionalunemploymentforemployeesintheseareas.Forexample,someworkersmightbenotbeabletomeetnewrequirementswhentransferringtonewpositions,letaloneinsomeruralareas,whenpoorerfarmersmaystrugglewiththelackofnecessaryworkskillsorqualifications.Second,forsomepartsofthepopulation,theimprovementofemploymentqualityiscriticallyindemand.Thispopulationreferstoflexibleemployees,especiallymigrantworkers,whichaccountsfor36percentoftotalurbanemployment,butonly40percentofthemhavesignedlaborcontracts.Theycan’tfullyenjoypublicservicesandtheirparticipationinsocialsecurityprogramshavealowrate.Manyofthemhavestrongmotivationtocomebacktoruralareasassoonastheyareover40yearsold.Thisisadangeroussignofurbanization’sreverse,whichwouldfurtherworsenthelaborshortage.Third,newpatternsofemploymentsuchasinformalemploymentareincreasing,whichwouldchallengethetraditionallaborrightsprotectionsystemthatusuallysecurestheserightsbasedontheworkunit.Howtobroadenthebenefitcoverageforinformalemployeesisanissuethatbothersmanycountriesaroundtheworld.Measurestotacklethechallengescanalsobefocusedintothreeareas:First,policiesshouldbebetterformulatedtoachieveadelicatebalancebetweenlabormarketflexibilityandthelaborsecuritysystem.Workersneedtobeencouragedtolearnmoreprofessionalskills,andatthesametimeenterprisesshouldallocatesocialresourcesinthemostefficientway,whichcombinedcanimprovesocialproductivity.Forexample,reformofthehouseholdregistrationsystemshouldbemovedforward,reasonablemeasurescouldbetakentoguidethefarmpopulationflowintocities,whichwoulddefinitelyincreaselaborsupply.InstitutionalimprovementsliketheLaborLawamendmentarealsoneeded,tobetterprotectemployees’rights.Second,measuresinthelongrunshouldbefocusingonhumanresourceeducationandcultivation.Asmanyteenagersusuallytendtogiveupstudyingandenterthelabormarketatveryyoungage,theyaredestinedtostrugglecopingwithemploymentfluctuationinthefuture.Soacomprehensiveeducationalandtrainingsystemcoveringtheentiresocietyandallagerangesisvitallyindemand,especiallytoimproveworkers’innovationandemploymentskills.Third,ononehand,thestructuralreformneedstokeeppushingforward,whileontheotherhand,socialpoliciesneedtobeusedasaguaranteeforresidents’basicstandardofliving.Sothepublicemploymentservicesystemshouldbeimproved,inordertoreducethetimeitcoststheunemployedtofindanotherjob.Andatthesametime,trytobreakinequalityofthecurrentsocialsecuritypublicservicessystem,whicharedividedbyruralandurbanareas,industries,identityandsexuality.Inoneword,alltheresidentscouldbenefitfromthereform’sachievement.Confidencefromthepublicfortheauthoritytotackletheemploymentissueshouldbestrengthened;solidprogresshasbeengraduallyobtainedinrecentyears.In2016,100billionyuanofspecialfundstocompensateemployeesincuttingover-capacityindustrieswereallocatedfromthegovernment,andpoliciesaimedatmakingtheentrepreneurshipenvironmentmorelivelyhavealsoseenfruitfulachievements.WuZheyu’sre-writefromCaiFang’sopinionarticlepublishedonPeople’sDaily.Havingasoundsleepthroughhypnosis编者按:2017年是张思娜成为催眠师的第9个年头。人跟人的关系,不是一天两天就能处好的。

  快速扩张被泼冷水  品牌受损,最直接的影响就是可能会拖慢黄记煌的上市进程。当前形势下,中方愿同澳方顺应地区求和平、谋发展、促合作的大势,以实际行动共同发出积极信号,稳定市场预期,为地区乃至世界传递中澳信心,做出中澳贡献。投资者据此操作,风险自担。

专家分析称。It"swhereimaginativeyouthimagine.Softmusicwaftsfromarecordplayerperchednexttothecafe"sbar.Youngpeoplesurroundingitthumbthroughbooks,massagepaintbrushesintoartworksandfiddlewiththeirphones.Severalengageinheateddiscussionatalectureinthenextroom.Othersrestintheirownroomsupstairs.It"slikeanyFridayafternoonat706YouthSpace.Theestablishmentisablendofalibrary,coffeeshop,hostelandeventcenter."706isaculturalandinformationharborcateringtoyoungpeople"sneeds,"founderWuFangrongsays."Itoffersalternativelifestyles."ThespaceislocatedinBeijing"sWudaokouarea,whichhousesthicketsofuniversities,includingsomeofthecountry"smostelite.Itspatronshailfromallwalksoflife.Thatincludesasubcultureof"slashers"-people,whoeachhaveseveral"slashcareers"-seekingaplacetoliveandaplatformtomakefriendsandshowcasetalents.  温州中院就指出,我国对于检查发现的问题该如何处理,现行法律法规没有明文规定,也没有成文的国家标准或行业标准予以规范。

约5分钟后,该管理员称已经下单,“算上送餐费5元一共28元,这单减完20元是8元,手续费是12元,再减一个送餐优惠4元,你付我16元就可以。ShandongpromotesculturalandtourismproductsinJapan(chinadaily.com.cn)Updated:2017-03-17The2017ShandongProvinceCulturalandTourismProductsExposition,jointlyhostedbytheShandongProvincialDepartmentofCommerceandShandongTourismDevelopmentCommittee,openedonMarch7inTokyo,Japan.Displayingtheprovince"sprofoundculturaldepositsandabundanttourismresources,thetwo-dayexpowasheldtopromotecommunicationandcooperationbetweenShandongandJapaninthefieldsoftourismandculture.Some100enterprisesandrelateddepartmentstookpartintheExpo,showcasingproductswithdistinctiveShandongfeaturessuchastraditionalhandicrafts,paintings,calligraphy,books,kites,paper-cuts,claysculpturesandwoodcarvings.AdocumentaryphotographyexhibitionontherepresentativetouristdestinationsofShandongalsotookplaceduringtheexpo.Shandonghasdeveloped10touristdestinationbrandsattractingpeopleacrosstheglobe--OrientalHolyLand,FairylandCoast,MountTaiinPeace,CapitalofAncientQiState,CityofSpringsundertheHeaven,TheGrandCanalBathedinConfucianism,HometownofWaterMargin,YellowRiverEstuary,AffectionateYimengandChinaDinosaurCity.Over200distinguishedguestsfromChinaandJapanattendedtheopeningceremony,duringwhichtheShandong-JapanEconomicandCulturalOrganizationUnionwasofficiallyestablished.AccordingtotheShandongProvincialDepartmentofCommerce,ShandongprovinceandJapanenjoyalonghistoryandgeographicaladvantagesincommercialandculturalcommunications.TheexpohelpedtopromoteShandongcultureandtourismaswellbetterbilateralunderstanding.TheculturalproductsshowcasedattheExpo,includingremarkablytruetolifetraditionalhandicraftsfromWeihai,QufuandJiaodongPeninsula,drewlargenumbersofJapanese.Theexpoalsofeaturedon-the-spotperformancesbyfolkartists.从目前情况看,对第一、第三问的解读,市场观点比较一致。

据测算,2016年全国涉海就业人员3624万人。  “救急”可期资金面紧日子未完  度过异常紧张的周一之后,周二,借资金、平头寸依然是银行间市场的主旋律。中午时分,大家同吃诺鲁孜饭。

至此,日本海上自卫队所有护卫编队都配备一艘准航母。三是反映资金面预期的IRS大幅冲高,1年期IRS盘中创逾两年新高。Atlastweekend"sopeningceremonyfortheHaidianDistrictSchoolHockeyLeague"sseason,SongandYingencouragedyoungsterstotakeupthesport."IcanimaginethatmoreandmorestudentshavepickeduphockeyinBeijing.Let"senjoythepassionandjoyofthesportaltogether...andIexpecttoseesomeofyouontheiceatthe2022WinterOlympics,"saidSong,whoisplayingcollegehockeyatCornellUniversityinIthaca,NewYork,inanticipationofchallengingforaspotintheNHL.Ying,whoseseasonwrappedupwhenRedStarwasknockedoutoftheKHLplayoffsthreeweeksago,saidthekeytograduatingfromjuniorhockeytotheproranksisperseverance."Therewillbealotofchallengesanddistractions,suchasaheavystudyload,theemphasisonacademicexcellenceinChinaandmaybeotherhobbies,"saidthe18-year-oldYing."Butonceyougetintothesportyouwillbeaddictedtoit.Myadviceistokeepworkingatitwheneveryoucanandtostickwithitnomatterwhathappens."Theschoolleague"snewseason,whichrunsthroughApril,involves40teamsandmorethan520primaryandsecondaryplayerscompetinginthreeagegroups.Althoughstillontheperipheryofnationalpopularity,hockeyisgrowingbyleapsandboundsinBeijing,asevidencedbythenumberofamateurclubsinthecapital.AccordingtotheBeijingHockeyAssociation,130teamsencompassingfivedifferentagegroupstooktotheiceduringtheBeijingMinorHockeyLeague"s2016-17season,whichwrappeduplastweek.That"sahugeincreasefromtheBMHL"sdebutseasonin2008,whenonlyfourteamscompeted.Morethan3,000juniorplayershaveregisteredwiththeassociationtotakepartinweeklyafter-schoolpracticesessionsandleaguecompetitions,saidSuJun,deputydirectoroftheyouthdepartmentofBeijingSportsBureau.Toprovidemoreadvancedtrainingandaccessiblefacilitiesforyoungplayers,WukesongArena,aBeijing2022venue,hassignedapartnershipwiththeHaidiandistricteducationcommissiontobecomeanextracurricularphysicaleducationbase.Thearena,whichhostsRedStarhomegames,willopenitsrinkforstudenttrainingsessions,offerfreeticketsforstudentstoattendgamesandwillorganizeprogramstohelptrainPEteachers.sunxiaochen@chinadaily.com.cn

其次,确定各类型智库的成长发展方向。秦安说,网络空间是一个新的领域,也是国家主权的一部分,中国《网络安全法》不是为了驱赶任何外企,而是为了维护中国网络主权安全。  北京一位新三板资深人士告诉《金证券》记者,就其从股转方面了解到的情况,包括交易门槛调整、再分层等利好政策的落地,其时间点可能在今年年中。

目前,周俊因涉嫌盗窃罪被警方依法刑拘。按照常理,朴槿惠肯定有问题,至少多少有点问题。但截至发稿,仍未收到该公司回复。

据某旅行社销售人员说,很多旅行社从3月初开始就主动不再推出电视购物商品。还有疑问,询问请到图片来源于新华社)据悉,腾提度体育将在以成都为首的西南地区,布局赛事IP、赛事版权、顶级体育明星、体育传媒、运动科技五大产业板块,涉及包括足球、篮球、拳击、路跑、网球、冰雪、棋牌、橄榄球在内的多个领域。

  据HTT公司提供的一个展示视频显示,列车的窗户可以展示轨道外的真实世界,以展现列车本身的高速。近年来,因诚信缺失和保障不力,不敢见义勇为、不敢做好人困扰着人们。该文章称,该驱逐舰支队为“九弟”,并介绍该支队是中国海军一支装备最先进的驱逐舰支队,是海军第一支列装相控阵雷达,能够进行区域防空的部队;是海军第一支具备舰空导弹垂直发射能力的部队;是海军第一支所有装备完全实现国产化的驱逐舰支队。

此外,斯皮尔伯格还正在做一个虚拟现实项目,所以,还是先让我们看看他会有什么样的成绩,当深入到该技术之后,能否改变斯皮尔伯格最初的看法呢。历史上,3月份财政存款通常会减少,相应会形成一定量的流动性投放。二是确保考试过程的安全和招生信息的安全。

  朝核危机时至今日,外界管不住平壤,然而平壤也对制裁予以了承受。  报道援引大韩足球协会22日消息称,长沙贺龙体育馆可容纳4万多人,中方考虑到治安问题,只开放3.1万个席位,并部署1万余名警力。“目前资本市场操作空间被抑制,大股东通过上市公司获得资金来源受限。

  【环球时报驻、记者韩晓明青木任重环球时报记者杜天琦】一些反恐专家就英美禁令的技术问题提出质疑。随后,合肥城市轨道交通有限公通报称,2015年9月23日,合肥地铁1号线供电系统总承包单位中铁电气化局通过竞争性谈判方式,确定陕西奥凯电缆有限公司为杂散电流监测电缆(主要用于监测泄漏电流)、隧道区间疏散指示电线(主要用于隧道区间疏散指示牌用电)电缆产品供货单位,合同价格约为155万元。二是强化责任刚性约束。