Arc cotangent
反余切
🧩 词语组成解析
arc
[ɑ:k]
n. 综合症状;弧（度）;天穹;电弧，弧光。;
vi. 形成拱状物;循弧线行进;
abbr. American Red Cross. 美国红十字会;
n. 余切\\n[电] 余切
🗣️ 情景例句
He gave them to me to hold on to them
他给我戒指， 要我自己保管，
Good morning !
早晨好！
I didn't know she could swim. Who taught her?
我不知道她会游泳。谁教她的？