安装在有轮距的2号人马座火箭上，美宇航局的2号机器宇航员重生为R2C2.这个机器人可以为深度探索太空起到侦查作用或者来协助宇航员太空行走。

The droid could be tasked to scout areas for potential crew visits or assist astronauts in spacewalks.

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当宇航员在太空行走时，他们会使用安全绳以保持他们与飞船的距离。

When on a spacewalk, astronauts use safety tethers to stay close to their spacecraft.

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宇航员在一个巨大的、特别的游泳池里进行水下太空行走的练习。

Astronauts practice spacewalks underwater in a huge special swimming pool.

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