Oligosiderite
少铁陨石
🗣️ 情景例句
What would you like for dessert?
甜点吃什么？
Think it over!
好好考虑一下吧！
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。