Warning: file_put_contents(/www/wwwroot/ppbbu/4cd.cn/cache/31356cf9fcc75a6307710344e1a12861.txt): failed to open stream: No space left on device in /www/wwwroot/ppbbu/4cd.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_沉淀汉英词典
It also carries out surveys through two specially-designed vessels which are fitted with the latest type of equipment including multi-beam echo sounders. 該部配備兩艘經過特別設計的測量船，船上裝有最新類型的設備，包括多波束廻聲測深儀。