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		     A:Why are you laughing?     你为什么笑?     B:I can't help it.     我实在忍不住。     注释:     a.I can't help it.     (我忍不住。)     本句中的help表示“抗拒”、“忍住”,it则指问句中的laughing。     b.help表示“抗拒”或“忍住”时常用于下列句型:     cannot help+动名词忍不住……     = cannot help but+原形动词     例:When Iheard the sad news,I couldn't help crying/l couldn't help but cry.     (我听到这悲伤的消息时,忍不住哭了。)
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