Hydroacoustic
a. 水底传音的,液压产生声能的
🗣️ 情景例句
I promise not to think about the city.
我保证不再去想城里的事。
I'm afraid you will catch a cold.
我怕你会感染到感冒。
It is time that we made a decision.
是我们作出决定的时候了。