a cold 与 colds的区别
问:a cold 与 colds 有何区别?
答：have (take, get, catch) a cold 指一次性的感冒,如:(1)I have a cold. 我患了感冒。
复形 colds 则用于经常或有时感冒,如:(2) Do you have colds?
复形 colds 也可用于多人一次性感冒,如:(3) Many pupils are absent with colds.
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