River bed
河床
🧩 词语组成解析
river
['rivə]
n. 河，江;溪，巨流;
bed
[bɛd]
n. 床;苗圃;河床;（地下由黏土、岩石等构成的）地层;
vt. 把…固定在;（某人）发生性关系;给人铺床;
vi. 上床;分层;
🗣️ 情景例句
It is not as difficult as it looks.
这并不像看起来那丢难。
Name your own price.
你自己说个价钱吧。
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。