Arctangent
反正切
🗣️ 情景例句
Do you want to get together and study sometime?
你想和我一起学习吗？
If you don't like it ,I wish you would say so.
如果你不喜欢，我想要你这样说。
The sudden barking frightened Clara.
突然的狗叫声吓坏了克拉拉。