Sound travels in sea water at about 4,800 feet per second. Knowledge of this fact for seamen to control ships and submarines is quite important.是什么意思_Sound travels in sea water at about 4,800 feet per second. Knowledge of this fact for seamen to control ships and submarines is quite important.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句