Arccos
反余弦
🗣️ 情景例句
If the problem is in the goods itself, you may make a claim on the supplier.
如果问题在货物本身，你可以向供货方提出索赔。
Is there anything I can explain fully?
有什么事情要我详细说明的吗？
We like the same music, the same food and the same books.
我们喜欢同样的音乐，同样的食物和同样的书籍。