Pericycloid
週摆线
🗣️ 情景例句
I'm happy to have this chance to meet with you. Mr. Howard Yang.
杨先生，非常高兴能有机会认识你。
A plant may produce new flowers; man is young but once.
花有重开日，人无再少年。
Maybe I could find out some useful information.
在那儿我也许会发现一些有用的资料呢。