它们在太空中，可以到达世界的任何地方。
They are in space, and they can reach any part of the world.
然而，有了宇航服，宇航员可以在太空中活动几个小时。
With a space suit, though, astronauts can move around in space for several hours.
他们提供了一个在太空中做实验和练习航天器对接的地方。
They provided a place for doing experiments in space and practicing spacecraft docking.
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