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在太空中飞行,飞船内有给航天员休息用的睡袋。航天员睡觉时,就像睡在床上一样舒服。失重时分不清上下,躺着站着都一样。所以,航天员可以
Flying in space, the spacecraft has sleeping bags for astronauts to rest. Astronauts sleep as comfortable as sleeping in bed. Indifferent weight up and down, lying and standing are the same. So, astronauts can