从地球上看，我们将地球赤道往天际延伸之后我们称之为天体赤道，也就是现在被描述成天空四周的一个圆形区域。当地球沿着轨道绕太阳公。

A circle all around the sky. We can also imagine that while the Earth orbits around the sun, from down here on the surface.

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我们往四周一看，车上的人都望着我们微笑着。

We looked around. Everyone on the bus was looking at us and smiling.

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我们往四周一看，车上的人都望着我们微笑着。

We looked around. Everyone on the bus was looking at us and smiling.

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