Arctan
反正切
🗣️ 情景例句
I think you can make a difference, Ellen.
我觉得你可以发挥影响力 ，Ellen。
The shoes are worn-out.
这鞋已经不能穿了。
Look into the river, said the monkey. There he is! See his head?
“往河里看，”猴子说，“他就在那里！看见他的头了吗？