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.

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。

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Know the signs of depression: apathy, loss of energy, loss of appetite, impaired concentration, loss of interest in favorite activities, feeling guilty, worthless, or hopeless.

了解忧郁症的征兆：冷漠，无精打采，没有胃口，集中力下降，对于曾经喜爱的活动失去兴趣，有负罪感，无价值感或是有绝望感。

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The net gain loss has relation to Er-doped concentration and input signal power.

净增益亏损与光波导掺铒浓度、入信号强度有关。

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The prosecutor said it was not a case of dangerous driving but "very much a case of momentary loss of consciousness and concentration".

BBC: Sir Ranulph Fiennes fined over car crash in Stockport

The disease begins with headaches and loss of attention or concentration.

FORBES: CTE in Brain Scans of Five Retired NFL Players - Now What?

Should the parents tell their children: 60% of NFL players have had at least 1 concussion, 26% had 3 or more, collectively claiming loss of memory, concentration, and problems with speech, headaches, and other neurological issues?

FORBES: Connect