essity[nəˈsesəti][可数名词]athingthatyoumusthaveandcannotmanagewithout必需的事物;ecessitiessuchasfoodandclothing.许多人甚至买不起食物和衣服之类的基本必需品。TextA:TheImportanceof?PublicTransportationPublictransportationisdefinedasaservicethatisavailableforusebythegeneralpublic.Itisacheaperandenvironmentallyfriendlyalternative.公共交通被定义为能为大众所使用的一种服务。它是一种相对便宜并且对环境有利的出行方式。alternative[ɔ:lˈtɜ:nətɪv]nounathingthatyoucanchoosetodoorhaveoutoftwoormorepossibilities可供选择的事物Youcanbepaidincashweeklyorbychequemonthly;thosearethetwoalternatives.你的工资可以按周以现金支取,或按月以支票支取。二者可选其一。TextA:TheImportanceof?PublicTransportationItisnotatransportationservicethatyoucanarrangeprivatelytosuityourownpersonalconvenience(althoughyoumay,toacertainextent,suchaspayingforacabinorsuiteonatrainorship)公共交通不是那种根据个人需求而随意安排的交通服务(虽然在某种程度上也可以这样做,比如说你可以付钱包下火车或船上的一个包厢),
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