Arctangent
反正切
🗣️ 情景例句
What is the charge for that?
那要多少费用？
Sometimes the best gain is to lose.
有时大得即大失。
Pupils of the school, old and new, will be sending him a present to mark the occasion.
为了纪念这个日子，学校的学生——无论老同学还是新同学——将送他一件礼物。