通过测量敲打和回声之间的时间间隔可以计算出该处海洋的深度。
The depth of the sea at that point can be calculated by measuring the time interval between the taps and the return of the echoes.
在船体外壳上敲打发出的声音会从海底反射。通过测量敲打与接受回声的间隔时间，这一点的海底深度就可计算出来。
A sound made by tapping on the hull of a shop will be reflected from the sea bottom, and depth of the sea at that point can be calculated.
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