Peritrochoid
外摆线圆
🗣️ 情景例句
He is a leader in his field.
他是他行业的领导者。
Excuse me, would you give me a hand?
对不起，你能帮我个忙吗？
He is also, incidentally, an unforgivable bore.
顺便说一句，他也是个不可饶恕的令人厌烦的人。