Arccos
反余弦
🗣️ 情景例句
Do you do hair coloring?
你做染发吗？
May I use the telephone?
我能用一下电话吗？
They decompose and are quickly destroyed by the weather or eaten by some other creature.
因为它们腐败之后很快就被风化掉，或被别的动物吃掉了。