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。

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

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实际上，无论BX - 1还是神舟七号都处在几乎一样的绕地轨道上，只有离心率稍稍不同。

In reality, both the BX-1 and SH-7 module were in almost exactly the same orbit around the Earth, with a slight difference in eccentricity.

youdao

实际上，无论BX - 1还是神舟七号都处在几乎一样的绕地轨道上，只有离心率稍稍不同。

In reality, both the BX-1 and SH-7 module were in almost exactly the same orbit around the Earth, with a slight difference in eccentricity.

youdao