Alumina
n. 礬土\\n[化] 礬土; 氧化鋁
??? 情景例句
You're growing so fast, Michelle.
長得太快了， Michelle。
What's done by night appears by day.
若要人不知，除非己莫為。
I slipped and fell downstairs.
我滑了一跤，從樓梯上摔下來了。