Knowledge structure
[计] 知识结构
🧩 词语组成解析
🗣️ 情景例句
She's having an illicit affair.
她有一个不道德的丑事。
When would you like to return?
你打算什么时候回来？
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。