✅ 同义词
🗣️ 情景例句
Do you remember when Daddy and I used to take you
你还记得爸爸和我常带你
This is Tom. He's my classmate.
这是汤姆。我的同学。
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。