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
It's such an important decision.
这是一个如此重要的决定。
We waved until the car was out of sight.
我们挥手直到汽车消失。
The manufacturers had to pay more money than they had anticipated, or they bought the biscuit from the student for $24,000.
饼干公司不得不付出比他们预计多得多的钱，因为为买下那学生烘制的饼干他们支付了24，000美元。