✅ 同义词
🗣️ 情景例句
I hear they intend to marry.
我听说他们打算结婚。
We can't wait any longer.
我们不能再等了。
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。