Warning: file_put_contents(): Only 0 of 6580 bytes written, possibly out of free disk space in /www/wwwroot/ppbbbu/n94.cn/index.php on line 55 echo-gram是什么意思，echo-gram的翻译，echo-gram音标、读音、用法和例句_94生活常识网有道词典
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。