夜间四处飞翔的普通蝙蝠在空中异常灵巧敏捷，但却无法从水平面上起飞。

The ordinary bat that flies around at night, a remarkable nimble creature in the air, cannot take off from a level place.

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当然，可由此从行星地球的天空中辨认太阳的运行轨迹，黄道平面在北半球夏季七月的天空中的位置很低。

Of course, defined by the path of the Sun through planet Earth's sky, the ecliptic plane rides low during July nights in the northern hemisphere's summer skies.

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如果我们将太阳在天空中的一年内运转轨迹描出，这将是另一个循环，这平面就是整个太阳系的黄道。

If we plot the position of the sun around the sky in a year, it will mark out a different circle in the sky which is the plane of the ecliptic of the solar system.

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