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| 11. | The flight proved that a spacecraft could orbit the moon and return to Earth safely. |
| 这次飞行证明了宇宙飞船可以环绕月球，并平安回到地球。 |
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| -- 来源 -- 交互式慢速英语-春季号 - Space Race (III) |
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| 12. | In the same way there exists a pull between the earth and the moon, which keeps the moon travelling in |
| 地球和月球之间也同样存在着引力，这使月球在围绕着地球的轨道上运行。 |
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