Mache
n. 马谢
🗣️ 情景例句
I'll be the leader.
我来当指挥。
Careful!
小心！
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。