Arcsin
abbr. arcsine 反正弦
🗣️ 情景例句
Merry Christmas, Carl and David!
卡尔，大卫，圣诞快乐！
David must figure on at least seventy strong men for support.
戴维至少须把七十个壮汉的协助计算进去。
The man opened it.
楼上人打开门。