🗣️ 情景例句
So, what were you two talking about?
你们俩刚才谈什么了？
Is this a live program?
这是不是现场广播节目？
and by measuring the time interval between the taps and the receipt of the echoes, the depth of the sea at that point can be calculated.
测出回声间隔的时间，便可算出该处海洋的深度。