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a while表示“一段时间”、“一会儿”：
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After a while the train stopped．过了一会儿火车停了下来。
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He was here a short while ago．前一会儿他还在这里的。
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I can only stay a little while．我只能待一小段时间。
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I’ve thought about it a long while．这事我想了很长时间了。
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张道真英语用法（大众珍藏版·第二版） B
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134 back
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back在用作名词时可以表示：
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背，背面：
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He patted me on the back．他拍了拍我的背。
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She was still a child, with pigtails down her back．她还是一个孩子，背上垂着两条辫子。
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She rode on the back of a donkey．她骑在驴背上。
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Did you paint the back of the bookcase？你漆没漆书柜背面？
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He rubbed his forehead with the back of his fist．他用手背揉他的前额。
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On the back of the letter was a diagram．信的背面画了一个图解。
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后面，后部：
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There is a garden at the back of the house．房子背后有一座花园。
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Three people can sit in the back of this car．三个人可坐在车子后部。
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She sat at the back of the aircraft．她坐在飞机后部。
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back也可用作副词：
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可以和一些不及物动词连用，表示回到某处：
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She’ll be back tomorrow．她明天回来。
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Do you think they will be back for lunch？你认为他们会回来吃午饭吗？
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