Arccosine
反余弦
🗣️ 情景例句
OK. We want you to get better, too.
我们也希望你能恢复健康。
We have 50 provinces.
我们有50个省。
It was called Saving the earth and it was all about the damage that is being caused to the world.
会议叫“拯救地球”，所以全是有关地球遭受破坏的事情。