Arccos
反余弦
🗣️ 情景例句
Today's exchange rate is 170.8.
今天的兑换率是一百七十点八。
The world is but a little place, after all.
有缘千里来相会。
Julie. I'm sure we'll win something this week.
我敢肯定这星期我们会赢一点的。