回声测深仪在导航仪器中的地位在下降，其原因是它存在着较多的误差。

The echo sounder is now gradually out of use in navigation, because it has many errors.

youdao

回声测深仪在导航仪器中的地位在下降，其原因是它存在着较多的误差。

The echo sounder is now gradually out of use in navigation, because it has many errors.

youdao