One characteristic of Earth's orbit is its eccentricity, the degree to which the orbit is an ellipse rather than a circle.

地球轨道的一个特点是它的离心率，也就是轨道是椭圆而不是圆形的程度。

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I thought about one of my favorite Sufi poems, which says that God long ago drew a circle in the sand exactly around the spot where you are standing right now.

我想起我最爱的一首苏菲诗歌，说神很久以前就在你此刻脚下的所在地周围，画上圆圈了。

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In fact, he was one of the first to explore the Arctic Circle, Which is a big deal.

实际上，他是第一个去探索北极得人，那是一件非常困难得事。

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And one which has taken the company full circle.

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At the center of the room is a circle of paired mannequins in which one half of each duo wears a '70s ensemble from Westwood-McLaren while the other wears a subsequent couture "take" on that ensemble.

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Before you can get started, though, you need to do a one-time calibration process, which involves following a circle moving around the screen.

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