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前者强调的特定的而后者不确定的,ok? The train is travelling at a speed of sixty miles an hour. Raindrop fall at a speed of about500to1,000feet a minute. at a speed of 后面强调数字数据~~~ 支持2L at the speed of 强调速度是持续的, 而at a speed of 强调一个瞬间的速度,是一个点上面的 |
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11个月前 sijianjiang : forrers gums run at the speed of 70 kilometers per hour! |