Arccosine
反余弦
🗣️ 情景例句
and you work late.
也工作到很晚。
The work shows the workman.
什么匠人出什么活。
There are countless people who, ever since their early years, have learned to associate snails with food.
有不计其数的人们从小就知道蜗牛可做菜。