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简介："Yourmotherneedsanewheart,"myfathertoldmewhenIcalledonthatDecemberafternoon.AlthoughmytwosistersandIknewthatMomhadheartproblems,thiswasshockingnews.WewenttogetherthenextdaytothehospitalinBostonforaconferencewithherdoctors.

简介：It’stime…是一个较常用的句型，意为“该……了”或“是……的时候了”，其后可接：

简介：新年第一天,小熊请来了它的好朋友,大家一起开起了新年Party。看它们又唱又跳的,多热闹呀！你能把这些小图剪下贴到图中正确的位置吗?并且说一说他们都在干什么？

简介：Inessence,twoepoch-makingeventsarereshapingtheworldordertoday:thecollapseoftheoldSovietblocandtheriseofAsia-Pacific,ofwhichChina’seco-nomictakeoffconstitutesanimportantpart.WhiletheformerbroughtanendtotheEast-WestColdWar,thelatterismakingtremendouscontributionstowards

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简介：AsNagano,Japan,passesonthetorchofthe2005SpecialOlympicsWorldWinterGames,Shanghaigetsreadytohostthe2007SpecialOlympicGames.

简介：ＩｎｃｒｅａｓｉｎｇｌｙａＷｏｍａｎ＇ｓＤｉｓｅａｓｅ￥ＺｈａｎｇＫｏｎｇｌａｉａｎｄＷａｎｇＹｉｎｇＡＩＤＳｉｓａｄｅａｄｌｙｓｅｘｕａｌｌｙｔｒａｎｓｍｉｔｔｅｄｄｉｓｅａｓｅｃａｕｓｅｄｂｙｔｈｅｈｕｍａｎｉｍｍｕｎｏ－ｄｅｆｉｃｉｅｎｃｙｖｉ...

简介：WiththefastgrowthofChina’seconomyinthepastdozenyears,itsairlineindustryhasexperienceda20%averageannualgrowthrate.Bytheendof1994,theannualtotalmileagereached6millionton/km;thenumberofairroutesjumpedfrom162in1978toover600;thenumberoftransportaircraftstoodatmorethan300;andthemaiorflightforceisuptotheworld

简介：大蒜节；母牛画节；金剪刀剪羊毛节；青蛙节；西红柿节；

简介：Iaskpatientforbearanceonetowardanotherthroughouttheland,andadeterminedeffortonthepartofeverycitizentodohissharetowardcementingahappyunion

简介：Unlikemostoftheothernon-foolishholidays,thehistoryofAprilFool'sDay,sometimescalledAllFool'sDaythatcanbepinpointedonthecalendar.Somebelieveitsortofevolvedsimultaneously(同时地)inseveralcultures,startedfromcelebrationsinvolvingthefirstdayofspring.

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简介：ＴｈｅＤａｌａｉ＇ｓＤｉｓｒｅｇａｒｄｆｏｒＰｒｅｃｅｄｅｎｃｅ￥ＤＯＪＥＣＥＤＡＩＮＴｈｅｅｎｔｈｒｏｎｅｍｅｎｔｃｅｒｅｍｏｎｙｆｏｒｔｈｅ１１ｔｈＢａｉｎｑｅｎＥｒｄｅｎｉ，ｈｅｌｄｏｎＤｅｃｅｍｂｅｒ８，１９９５，ｉｎｔｈｅＴａｓｈｉｌｈｕｎ...

简介：ＲｅｃｏｌｌｅｃｔｉｏｎｓｏｆａｎＡｍｂａｓｓａｄｏｒ＇ｓＷｉｆｅ（Ⅵ）ＢｙＺＨＵＬＩＮＩｎｔｈｅＵｎｉｔｅｄＳｔａｔｅｓＳｏｏｎａｆｔｅｒｍｙａｒｒｉｖａｌｉｎｔｈｅＵｎｉｔｅｄＳｔａｔｅｓ，Ⅰｂｅｇａｎｔｏｐａｙｍｙｃｏｕｒｔｅｓｙｖｉｓｉｔｓ．...

简介：初一课本里，缩略词“’s”随处可见，同学们往往把它统统看作“是”,以致闹出许多笑话来，如把Liki’scat(李雷的措)说成LiLeiiscat(李雷是猫)。“’s”有两种意思，同学们在理解句意时应注意分辨。

简介：EveryFebruary,acrossthecountry,candy,flowers,andgiftsareexchangedbetweenlovedones,allinthenameofSt.Valentine.Butwhoisthismysterioussaintandwhydowecel-ebratethisholiday?

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简介：6.2相位模糊和解决办法6.2.1四次方律锁相环的相住模糊由锁相环基本原理知道,如果斜率为正,在(φ)i处是锁相环的平衡点,那么4(φ)=2nπ+(φ)i,上各点都是锁定的,其中(φ)i为剩余相差,当环路增益足够高,假设剩余相差可以忽略不计,那么4(φ)=2nπ,说明在0、π/2、π、3π/2这四个点都是稳定的平衡点.

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