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
Extraterrestrial Environment: How It Affects the Way Things Work or Do Not Work vacuum and high pressure, low and high temperature, gravity or lack of, geological uncertainty;