即失去重力或重力可以忽略不记的环境下，如太空中的失重环境。
科学家还不清楚高钙浓度是由于失重环境下宇航员的骨质流失还是另有其因。
Scientists do not yet know if the high calcium concentration is due to bone loss, a consequence of living in a zero-gravity environment, or other factors.
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。
Virtually every child has dreamed of traveling in space and experiencing what it would be like to live in a gravity-free environment.
其中一些设备用来测试太空环境(如明显的失重)对人体的影响——其生物样本包括乘组人员。
Some of the equipment measures the effects of space conditions, such as apparent weightlessness, on biological specimens — including the crew.
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