But astronauts start losing muscle mass within days of entering a zero-gravity environment, and the longer they stay in space, the more their muscles shrink.
航天员在进入零重力环境的几天之内就开始出现肌肉流失。
Virtually every child has dreamed of traveling in space and experiencing what it would be like to live in a gravity-free environment.
几乎每个孩子都曾梦想去太空旅游，体会一下在失重环境下生活是什么样子。
In a low-gravity environment, like inside a space shuttle, food and drinks would simply float away if they weren't handled correctly.
在一个失重空间里，比如航天飞机，如果不抓着食物和喝的东西，它们通常会漂浮在空中。
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