epicycle
n a circle that rolls around (inside or outside) another circle; generates an epicycloid or hypocycloid
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一个围绕另一个圆圈（内部或外部）滚动的圆圈; 产生外摆线或内摆线
epicycle
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See AllWhen something is deducible, it follows logically from a general principle, meaning you can figure it out by working through it. Your...
To perplex someone is to amaze, baffle, bewilder, dumbfound, flummox, mystify, or puzzle them. Perplexing things are hard to understand....
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