Beyond the moon everything is perfect, things move in perfect circles.

月亮背面所有的事物都是完美的，它们朝着完美的运行轨道移动。

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The planets did not seem to move around the Earth in perfect circles as they should.

行星似乎没按应有的方式围绕地球进行完美的圆周运动。

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Such perfect circles of corn or wheat have been known about for centuries. They used to be feared as the work of the Devil.

这些怪圈的历史长达几个世纪，人们以为它们是魔鬼的作品，对此深感恐惧。

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QB1, move in nearly perfect circles.

ECONOMIST: Unbuckling the Kuiper belt

Granted, Klipsch has that oval shape all sorts of locked down, but once you've used an ear tip that's actually engineered to fit in one's ear (hint: ear holes aren't perfect circles), you'll have a hard time using anything else.

ENGADGET: IRL: Logitech UE 900 headphones, Nokia Lumia 900 and the Galaxy Note II