Warning: file_put_contents(/www/wwwroot/zidian/diubi.cn/cache/4bc43fa1d30ee0039f10dac45d4f8f39.txt): failed to open stream: No space left on device in /www/wwwroot/zidian/diubi.cn/index.php on line 59 echo-sounder英英字典_echo-sounder剑桥英语解释_echo-sounder柯林斯英文解释_果味酸柯林斯词典
1. N a navigation and position-finding device that determines depth by measuring the time taken for a pulse of high-frequency sound to reach the sea bed or a submerged object and for the echo to return 廻聲測深儀