vt.防止；阻止；阻碍；阻挠记忆pre预先+vent来→预先来到→抢先一步，防止别人先到→防止第三人称单数：prevents现在进行时：preventing过去式：prevented过去分词：prevented派生词：preventableadj.造句:1.Theytookactivestepstopreventthespreadofthedisease.他们采取积极措施，防止疾病蔓延。2.Wearetakingstepstopreventpollution.我们正在采取措施防止污染。3.Snowhaspreventedcommunicationwiththeoutsideworldforthreedays.大雪使得与外界的通信联系中断了三天。4.Earlywarningsofrisingwaterlevelspreventedanothermajorcatastrophe.提前发出的洪水水位上涨警报防止了又一次的重大灾害。5.Nothingwouldpreventhim/hisspeakingoutagainstinjustice.什么也阻挡不了他为不平之事鸣冤叫屈。