Preknock
预爆震
🗣️ 情景例句
Well, I'd better be on my way.
好啦，我该走了呢。
Let's talk about something else.
让我们谈点别的什么吧。
So was born the echo-sounding apparatus, now in general use in ships.
这样就产生了目前各种船舶上普遍应用的回声探测仪。