Arccos
反余弦
🗣️ 情景例句
Sorry to trouble you, do you have these shirts in any other colors?
麻烦你了，你们有其他颜色的这种衬衫吗？
Where are you headed?
你要到哪里去？
Sorry! You look the same!
对不起，你们两个看上去一样。