Overcrowding imposes mental strains.

过度拥挤使精神紧张。

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Psychological profiling and training of the astronauts, plus constant communication with Earth, would reduce debilitating mental strains, the two scientists said.

两位科学家表示，对宇航员的心理分析和训练，再加上能持续与地球通讯，将降低他们的精神紧张程度。

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The military has begun to grapple with the mental and emotional strains endured by personnel who may never come face to face with a Taliban insurgent, never dodge a roadside bomb or take fire, but who nevertheless may be responsible for taking human lives or putting their colleagues in mortal danger.

NPR: AP IMPACT: Combat Stress Felt Far From Front Lines