Society exists only as a mental concept; in the real world there are only individuals.

社会仅仅以一种精神概念而存在，真实世界中只有个体存在。

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Scholarliness is only an abstract mental concept, but can be reflected in concrete ways.

“书卷气”虽然只是个抽象的精神概念，却可以通过十分具体的方式表现出来。

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Youth is more of a mental concept, according to Zhang.

张颐武认为，青春更多的是一个精神层面上的概念。

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Whether or not optogenetics itself becomes a therapy, Deisseroth hopes he will help psychiatrists move beyond the simplistic concept that mental illness is caused by depressed levels of brain chemicals like serotonin and dopamine.

FORBES: Magazine Article

Under the changes, the partial murder defence of diminished responsibility has been replaced with "a modernised definition", based on the concept of "an abnormality of mental functioning which arose from a recognised medical condition", the ministry said.

BBC: Defence law changes for killing after domestic abuse

The hearing showed agreement in concept on some issues, such as strengthening mental health screening.

CNN: February 1, 2013 -- Updated 0041 GMT (0841 HKT)