echo depth sounding

• 回声测深

echo depth sounding的用法和样例：

例句

1. It also carries out surveys through two specially-designed vessels which are fitted with the latest type of equipment including multi-beam echo sounders.
   该部配备两艘经过特别设计的测量船，船上装有最新类型的设备，包括多波束回声测深仪。