Arctan
反正切
🗣️ 情景例句
No sweat! I'd be happy to help.
没什么！很高兴我能帮上忙。
After the play was over,we all wanted to get something to eat.
在戏完了以后，我们都想要吃一些东西。
Mum! I feel a little better now.
妈妈！我现在感觉好一点了。