Arcsec
abbr. arcsecant 反正割
🗣️ 情景例句
Now what?
又怎么了？
The fool doesn't suspect a thing.
傻人不疑心什么。
it is extremely difficult to estimate the true value of the services which people perform for us.
但要估算别人为我们为所提供的服务的价值却是极其困难的。