简介：火的出现，让人类拥有了对抗黑夜的法宝。最初，原始人把动物脂肪或者蜡一类的东西涂抹在木棍上，做成照明用的火把。

简介：

简介：就像是drose1和drose1.5一样,在drose2和drose2.5之间也拥有一段密不可分的完美传承。超轻质的SprintWeb材质鞋面在减轻球鞋重量的同时,为双脚提供足够的足部支撑,这样的新式轻质科技鞋面在adiZeroCrazyLight球鞋上首创,经过若干不同球鞋上的实验,在drose2.5上得到更精确的改进,让球鞋更加适合选择他的穿着者——德里克-罗斯。

简介：

简介：你可能会说，你孤身前行无人可以依靠你的生活岌岌可危，像把上了膛的枪你正在发抖，亲爱的

简介：

简介：

简介：在又一次重新修整我乡下花园的过程中，我决定为一位就要结婚的朋友举行一个大型的庆祝晚会。我邀请了她的60个朋友，然后我便又以更大的热情投入对花园的整修中。我决定为她举行一个花园晚会，当然这也是不得已的事情，因为无论他们挤得多紧我的房子也装不下60个人。况且，花园晚会，听起来就很不错。

简介：廖晓义是中国第一位获得有“诺贝尔环境奖”之称的“苏菲环境奖”的民间环保人士。作为北京地球村环境文化中心的创办人和负责人,她从2002年起被北京奥组委邀请担任环境顾问,配合北京奥组委等机构出台了绿色奥运生态旅游的宣言和行动指南。2006年,廖女士入选“2006绿色中国年度人物”。本文摘自廖女士接受国外一家媒体的采访,经廖女士亲自审阅并添加部分内容后发表于本刊。

简介：

简介：

简介：Background:Wearablemonitors（WMs）areusedtoestimatethetimespentinsedentarybehaviors（SBs）andlight-intensityphysicalactivities（LPAs）andtheirassociatedenergycost;however,theaccuracyofWMsinmeasuringbehaviorsonthelowerendoftheintensityspectrumisunclear.Theaimofthisstudywastoassessthevalidityof3WMs（ActiGraphGT3X+;activPAL,andSenseWear2）inestimatingtheintensityofSBandLPAinadultsascomparedwiththecriterionmeasureofoxygenuptake（VO2）measuredbyindirectcalorimetry.Methods:Sixteenparticipants（age:25.38±8.58years）woretheActiGraphGT3X+,activPAL,andSenseWear2devicesduring7sedentary-to-lightactivities.VO2（mL/kg/min）wasestimatedbymeansofaportablegasanalyzer,OxyconMobile（Carefusion,YorbaLinda,CA,USA）.Alldataweretransformedintometabolicequivalentsandanalyzedusingmeanpercentageerror,equivalenceplots,Bland-Altmanplots,kappastatistics,andsensitivity/specificity.Results:MeanpercentageerrorwaslowestfortheactivPALforSB（14.9%）andLPA（9.3%）comparedwithotherWMs,whichwere>21.2%.NoneoftheWMsfellwithintheequivalencyrangeof±10%ofthecriterionmeanvalue.Bland-AltmanplotsrevealednarrowerlevelsofagreementwithallWMsforSBthanforLPA.KappastatisticswerelowforallWMs,andsensitivityandspecificityvariedbyWMtype.Conclusion:NoneoftheWMstestedinthisstudywereequivalentwiththecriterionmeasure（VO2）inestimatingsedentary-to-lightactivities;however,theactivPALhadgreateroverallaccuracyinmeasuringSBandLPAthandidtheActiGraphandSenseWear2monitors.

简介：Inthepast,blast-resistantdesignsforstructureswereoftenconstructedwithmassivetypestructuralsystems,whichreliedmoreonbrutestrengththanonfinessetoachievetherequiredblastresistance.However,structurescomposedofCOLD-FORMEDsteelcomponents,suchassheetmetalandmetalstuds,haveshowngreatpromiseinprovidingblastresistancewiththeaddedbenefitsoflowcostandeaseofconstruction.Someexamplesofusingsuchstructurestoprovidecontainmentforpackagehandlingfacilities(PHF)aredescribedinthepaperforsituationswhereblastcontainmentisneeded,suchasapotentialpackagebombbeingdiscoveredduringthepackagevettingprocess.Resultsfromtestsandanalyticdataareusedtoillustrateaspectsofdesignpeculiartosuchtypesofapplications.DesignsforspecificcapacitiesofPHFaredescribed.

简介：Beingavisually-impaired(VI)studentattendingmainstreamclassesposesachallengetothemconsideringthelimitationpresentedbytheirlimitedvision.Thisphenomenologicalstudytriedtoexplorethesedifficultiesandidentifythedifferentcopingskillsthathelpedtheminpursuingtheirschooling.ItwasfoundoutthatVIstudentsdevelopedacertainadaptivemechanismthatenablesthemtosurvivetheiracademicjourney.Theirdifficultytaughtthemtoinnovatethemselvestobecomeaccustomedtothegrowingdemandofsocietyforthemtobeequallycompetitiveandproductiveindividualthatdoesnotconsidertheirdifficultiesashindrance.ItwasfoundoutthatVIstudentswhoareinthemainstreamclasseshaveastrongersocio-academicadaptabilitywhichenablesthemtorelatethemselvestotheirmainstreamcounterpartsandtoexcelintheiracademics.Thestudyrevealedthattheirsocialadaptationinvolvesstrongspiritualfoundation,self-confidence,self-motivation,senseofbelongingness,andbettersupportsystemfromfamiliesandfriends.Ontheotherhand,theiracademicadaptationincludestechnology,effectiveteacheraides,innovativestrategies,andmaterialsfortheblind.Whenallthiscomponentsareconsidered,thereisanassurancethatVIstudentsattendingmainstreamclassescanfinishtheirschooling.

简介：

简介：

简介：

简介：Background:Identifyingfactorsassociatedwithphysicalactivity(PA)isusefulinplanninginterventionsandpolicies.Theaimofthisstudywastoidentifysociodemographic,biological,andpsychosocialfactorsassociatedwithPAperformedinschoolsettings.Methods:Datacollectedforthepresentstudyincludedgender,age,socioeconomicstatus,bodyfatpercentage,aerobicfitness,self-efficacy,attitudes,peerandparentalsupport,andperceptionofschoolenvironment.Dependentvariableswerelight-intensityPA(LPA)andmoderate-to-vigorousintensityPA(MVPA)performedduringschooltime,recesses,andphysicaleducation(PE)classes.Multipleregressionanalyseswereperformed.Results:Participatingadolescents(n=567,53%female,12.9±5.3years)spent5%ofschooltimeinMVPAand27%inLPA,15%ofrecessesinMVPAand44%inLPA,and16%ofPEclassesinMVPAand41%inLPA.BoysengagedinmoreMVPAinallcategories.AgewasinverselyrelatedwithMVPAandLPAinallperiods,whereasbodyfatpercentagewasinverselyrelatedwithMVPAinschooltimeandPEclasses.AttitudewasinverselyrelatedwithMVPAinallperiodsandwithLPAinrecesses.ConsideringPAtobegoodandenjoyablewaspositivelyassociatedwithMVPAinschooltime.Conclusion:AdolescentsspentlittletimeinPAduringschool.Futureinterventionsshouldimplementenjoyableactivitiesatschool.

简介：摘要：自改革开放以来，中外文化交流日益频繁，人们逐渐意识到语言作为文化交流的主要工具，基于此时代背景下，语言教育成为时代发展的必然要求，突出表现为英语作为我国学校的必考科目。英汉双语比较教学法往往比单语教学更有效率，同时双语教学也代表着教育者的教学能力与教学水平。本文以双语light up science版本为例，提出英汉双语比较教学法在小学英语教学中的应用策略，希望供以参考。

简介：【摘要】