Mental stress, which is closely related to stressor, is an objective mental phenomenon in real life.

心理压力是现实生活中客观存在的心理现象，与压力事件密切联系。

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Euphemism is a mental phenomenon and study on its mechanism should be based on cognitive explanation.

委婉是人的心理现象，对委婉机制的研究离不开对认知心理的解释。

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Language anxiety as a complicated mental phenomenon specific to language learning has consequently drawn more and more concern.

语言焦虑是在语言学习过程中产生的一种复杂心理现象。

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Dr. Edward Ritvo, professor emeritus at UCLA's medical school and one of the psychiatrists who wrote the original definition of autism for the Diagnostic and Statistical Manual of Mental Disorders, explains the phenomenon in a very different way.

FORBES: Magazine Article

Neither are mental problems a strictly modern-day phenomenon.

BBC: Bitter-sweet sympathy

All the doctors, psychologists and mental health experts tell us the same thing: This is what happens next in a phenomenon like this.

NPR: A New Orleans Stoop: Solace After the Storm