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以上来源于: WordNet
N (in the Ptolemaic system) a small circle, around which a planet was thought to revolve, whose centre describes a larger circle (the deferent) centred on the earth (托勒密体系)本轮 [astronomy]
You see how this epicycle theory could account for the seemingly backward motion of the planet.
你可以看到这个本轮理论是如何解释行星看起来像在做反向运动的。
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The carbon cycle has thus acquired another epicycle, and become even more complicated to understand than it was.
碳循环因此又得纳入另一个亚循环，以致变得更加复杂难以理解。
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