核心问题
有一本英语词典说, My brother has a cold. 但 You may catch cold if you go out without a coat. 难道不可以说 catch a cold 吗?
词典解答
最常见的情况是 catch cold(不带不定冠词),但也偶尔可见到带不定冠词的用法:
Put on some warm clothes or you'll catch (a) cold. (ALD)
在其他情况 cold 则必须带不定冠词：
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I've got a cold. (Snow) 我感冒了。
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I was in Florence until recently, but I caught a heavy cold. (Mansfield) 直到最近我还在佛罗伦萨，但我得了重感冒。
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Our daughter had a terrible cold last week. (CGEL) 上周我们的女儿得了一场重感冒。