Postlabrum
后上唇
🗣️ 情景例句
I would like to improve my English pronunciation.
我想改善我的英语发音。
Patience and application will carry us through.
忍耐和努力会使我们度过难关。
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。