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.
尽管中国的货币在帮助本国向他国出口产品和服务方面功不可没，但是中国6月的贸易顺差却另有其因。
Although China's currency has generally helped the country sell goods and services cheaply abroad, June's trade surplus has more to do with factors beyond the yuan's value.
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