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英语
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sound travels at 340 meters per second in air.travels 为什么用at?
人气：406 ℃ 时间：2020-02-24 00:04:29
解答
音速,因为这是表示具体时间内的事情 所以用atper 是每的意思整句话是说声音能在空气中每秒传播340M
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