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| 1. | Alternatively, if the star were small, the life-supporting planet would have to have a close orbit round |
| 反之，如果恒星很小，维持生命的行星就要在离恒星很近的轨道上运行，而且要有极好的条件才能使生命得以发展。 |
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| 2. | close-orbit satellite |
| 低轨道卫星 |
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| 3. | Alternatively, if the star were small, the life-supporting planet would have to have a close orbit round |
| 反之，如果恒星很小，维持生命的行星就要在离恒星很近的轨道上运行， |
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| -- 来源 -- 新概念英语第三册 - From the earth: Greetings |
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| 4. | First, we know that the planets all orbit close to the earth's orbital plane, the ecliptic. |
| 首先，我们知道所有行星的轨道都很靠近地球的轨道平面――黄道面。 |
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