✅ 同义词
🗣️ 情景例句
What classes are mandatory for your major?
你的专业什么课是必修的？
All covet, all lose.
贪多必失。
and we control it by means of the mud which we circulate down the drill pipe.
我们让泥浆顺着钻杆向下循环，用这种方法来控制压力。