Epicycloid
n. [数]圆外旋轮线, 外摆线
🗣️ 情景例句
let you and I talk about it.
我们就来讨论一下。
Riches serve a wise man but command a fool.
财富事智者，却又驭蠢人。
Travellers on short trips to areas with water supplies of uncertain quality should avoid drinking tapwater, or untreated water from any other source.
短途旅行到水质不保险的地区时，应避免饮用水龙头的水或未经处理任何其他来源的水。