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17.5 用特殊引导词引导的定语从句
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有时，than, as, but也可以引导定语从句。
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17.5.1 than引导定语从句
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当先行词是比较级或先行词由形容词比较级修饰时，用than作关系代词，引导限制性定语从句。
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By yielding you get more than you expected.
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退让一步，你会获得比预想还要多的东西。
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Wise people always make more opportunities than they find.
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聪明的人创造的机会总是比自己发现的机会更多。
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Many come through periods of stress with more physical and mental vigor than they had before.
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经历过压力的人在身体和精神上都比以前更加坚强。
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17.5.2 as引导定语从句
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as可以作关系代词，既可以引导限制性定语从句，也可以引导非限制性定语从句。
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a 引导限制性定语从句
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当主句出现such, as, the same等词时，定语从句往往由as引导，从而构成固定结构。
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Take such measures as the situation calls for.
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按形势所需采取相应对策。
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I am the same person when I’m in the spotlight as I am when I’m alone.
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当我处在聚光灯下时和当自己独处时是同一个人。
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There are as good fish in the sea as ever came out of it.
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海里的好鱼取之不尽。
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b 引导非限制性定语从句
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as引导非限制性定语从句时，从句可以置于先行词之前，而且从句经常修饰整个主句的情况。
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As we have noted, few people are total winners or losers.
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正如我们已经指出的，很少有人大获全胜或彻底失败。
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As Eleanor Roosevelt observed, “No one can hurt you without your consent.”
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