Pushbutton
n. 按钮
✅ 同义词
🗣️ 情景例句
What are you so upset about?
什么使你如此难过？
See you again.
再见。
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。