Active sonar
[电] 有效声纳
🧩 词语组成解析
active
['æktiv]
adj. 积极的，活跃的，有生气的;迅速的，敏捷的;有效的，起作用的;
n. [语法]主动语态;积极分子，活跃的人;
sonar
['səunɑ:]
n. 声呐装置，声呐系统;声呐兵;
🗣️ 情景例句
How much notice of cancellation is necessary to get my deposit back?
想把定金拿回来，要提前多长时间通知你才行？
Did the chicken come before the egg?
先有鸡还是先有蛋？
One of Charlie Chaplin's most famous films was The Gold Rush, which was made in 1925.
查理·卓别林最著名的影片之一是《淘金热》，它是在1925年摄制的。