Vulnerale
弱小的,脆弱的
🗣️ 情景例句
It's nice to be alone with you, Grandpa.
很高兴单独与你在一起， 爷爷。
You should wear a something warm, It's chilly today.
你应该穿暖和一些的衣服，因为今天很凉。
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。