A sound made by tapping on the hull of ship will be reflected from the sea bottom ,and by measuring the time interval between the taps and the reciept of the echoes,the depth of the sea at that point can be calculated.
A sound made by tapping on the hull of ship will be reflected from the sea bottom ,and by measuring the time interval between the taps and the reciept of the echoes,the depth of the sea at that point can be calculated.
通过敲打船体，声音会从海底返回；这样，通过测量敲打声和回音的间隔时间，就可以得知敲打处海洋的深度。