Flynut
蝶形螺母
🗣️ 情景例句
Are you still doing your photography?
你还在搞摄影吗？
Marvellous.
妙极了。
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。