Magnoliophyta
[植]木兰门
🗣️ 情景例句
I think I want to study journalism
我想学新闻学
To roar
吠叫
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。