Arccosecant
un. 反余割
🗣️ 情景例句
Sit down, sit down. Have some coffee.
请坐， 请坐。喝点咖啡。
He devoted his life to promoting world peace.
他一生致力于促进世界和平。
I usually come by bus. What about you?
我平常乘公共汽车。你呢？