根据月球研究和行星际飞行任务的需要，为了提高火箭的推重比，要为运载火箭新安装一个第三子级。
Missions for study of the Moon and interplanetary flight required re-equipping the launch vehicle with a third stage to increase its power-mass characteristics.
NASA 的计划还打算研究建立月球殖民地的想法。
NASA's program also intended to study the idea of establishing a moon colony.
正是这种对未知的感觉，使得月球的远侧成为科学和太空研究的一个有趣的地方。
It's this sense of the unknown that makes the far side of the moon such an interesting place for scientific and space research.
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