Scientists do not yet know if the high calcium concentration is due to bone loss, a consequence of living in a zero-gravityenvironment, or other factors.
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。
2
But astronauts start losing muscle mass within days of entering a zero-gravityenvironment, 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。
3
Due to the feeling in zerogravityenvironment and the earth has big differences, astronaut's sense and consciousness face the big challenges.