Epicycloid
n. [数]圆外旋轮线, 外摆线
🗣️ 情景例句
I type about 40 words per minute.
一分钟我能打40个字。
Strong winds howls.
咻咻地刮着强风。
So I drove back to the town and began to retrace the route, taking frequent glances at the map.
于是我驾车返回小镇，重新按路线行驶。