Case studies of children who are isolated from others reveal that they lack a firm self-concept, and their mental and psychological development is severely hindered by lack of language.

对孤立儿童的个案研究表明，他们缺乏坚定的自我概念，而其语言能力的缺乏严重阻碍了他们的智力和心理发展。

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In Europe and Africa during World War II, the proportion of mental traumas among all casualties was close to one in four — one mental health case for every three blood wounds.

二战时，在欧洲和非洲战场的伤病员中，士兵遭受精神创伤的比率接近每四人中就有一例病例，一人精神受创，另外三人身受重伤。

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Such is the case with the mental game.

这里有心理竞技的案例。

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