Arctan
反正切
🗣️ 情景例句
Yes. The number, please,of the Staten Island Ferry lost-and-found office.
我想问一下Staten岛渡轮失物招领处的电话号码。
What's the rush?
你急什么？
I received an invitation, but I did not accept it.
我收到-份请帖，但没有接受。