Arctangent
反正切
🗣️ 情景例句
I have a heavy class load this term.
这个学期我的功课很重。
Kept waving to her mother until the train was out of sight.
不断地冲她的母亲挥手，直到火车驶出了视线。
Hello! Sydney 7654392.
喂！我是悉尼7654392。