Pellosil
二氧化硅
??? 情景例句
and make sure that it is in good condition
確定它狀 良好
Constant dropping wears away a stone.
滴水穿石。
People become quite illogical when they try to decide what can be eaten and what cannot be eaten.
在決定什么能吃而什么不能吃的時候，人們往往變得不合情理。