国际空间站有人常驻吗?年耗30亿美元的太空实验室,如何维持16国宇航员轮值,国际空间站,耗资30亿美金的太空实验室,16国宇航员如何轮值常驻
Is there a permanent resident on the International Space Station? How does the space laboratory, which costs 3 billion US dollars annually, maintain the rotation of astronauts from 16 countries? How do astronauts from 16 countries stay on duty at the International Space Station, a space laboratory that costs 3 billion US dollars
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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