1、Inspection installation and water tightness transducer of echo sounder on berth.
測深儀換能器船臺安裝和水密性檢查。

2、Use echo sounder frequently when passing shallow water.
通過淺水域時，要常用回聲儀測深。

3、The echo sounder is now gradually out of use in navigation, because it has many errors.
回聲測深儀在導航儀器中的地位在下降，其原因是它存在著較多的誤差。

4、Echo sounder of type HS-1 for use in sediment-laden water
HS-1型回聲渾水測深儀的原理和結(jié)構(gòu)

echo sounder翻譯