Arccos
反余弦
🗣️ 情景例句
Turkey and ham are traditional dishes for Christmas.
火鸡和火腿是圣诞节传统的食物。
We think your Chunlan brand air conditioners will be selling well at this end and we are looking forward to receiving your samples soon.
我们认为你方的春兰牌空调机在这里会很畅销，希望很快收到你们的样品。
Which boy?
哪个男孩？