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.
该零碎应用发射超声波与反射回波时间差来测量待测间隔。
The launch system USES ultrasonic echo and reflection of the time difference to measure the distance test.
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