off down out across的区别

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介词down、out 、off、across的用法区别：down：prep.往…的下端；在…下方；沿着；贯穿如：There is a librarydownthe street.这条街走到底有一个图书馆She walkedacrossthe floor and lay down on the bed.她走过地板最后躺在了床上。

across作介词时意为“ 从……的一边到另一边，穿过；在……对面，另一边……如：He walked across the field. 他走过田地。There's a bank right across the street. 街对面就有一家银行。out：adv.出局；在外，在外部；prep.（从…里）出来。Carefully pulloutthe centre pages...小心翼翼地抽出中间的几页。He tookouthis notebook and flipped the pages.他掏出笔记本，飞快地翻着。off意为：从（某处）落下；离开；（时空上）偏离 。如：I fell off the ladder. 我从梯子上跌了下来。He took several booksoffthe shelf.他从架上拿下书。