Phyllite
n. [地]千枚岩,硬绿泥石
🗣️ 情景例句
I'm heading off for bed
我先去睡觉了
To exercise in the garden
在花园里做操
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。