Weldite
白硅铝钠石
🗣️ 情景例句
Oh. Oh, where did you get that?
噢。噢， 你们从哪儿弄来的？
How long will you remain there?
你将会在那里逗留多久？
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。