Arcsec
abbr. arcsecant 反正割
🗣️ 情景例句
I'm very grateful, Robbie.
非常感谢你 ，Robbie。
May I take your message?
你需要留言吗？
and the profits from the exhibition were used to build museums and colleges.
博览会的赢利用来建造博物馆和高等学校。