Esmarkite
褐块云母
🗣️ 情景例句
Never know what?
说不定什么？
I think the teacher works us too hard.
我觉得教师害得我们太苦了。
It was his job to repair bicycles and at that time he used to work fourteen hours a day.
他那时的工作是修理自行车，并且通常是一天工作14个小时。