But such fast trains would take a long time to put in place in the United States.
VOA: special.2011.02.11
But because the way sound waves operate, we have these low sound waves taking a very long time to clear.
但鉴于声波的传播方式,低声波要过更长的时间才消失
And yeah, it takes a long time to get good at it. A lot of fitness, too. A lot of working out.
要想划得熟练需要时间。体能也要好。再加上大量的锻炼。
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