Penic. cam.
[医] 驼毛刷
🗣️ 情景例句
I think that you're very successful
我认为你事业有成
Compare your grievs with other men's and they will seem less.
你的悲痛与人比，悲痛就会轻一些。
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。