Linish
n. 砂帶磨光
??? 情景例句
Fine, Somsak. And you?
很好。 Somsak ，你呢？
This isn't a laughing matter.
這種事是不能開(kāi)玩笑的！
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.
測(cè)出回聲間隔的時(shí)間，便可算出該處海洋的深度。