All symptoms of minor depression, except for the cerebral region responsible for sleep disorder, were encoded in the joke.

轻度忧郁症该有的症状除了睡眠品质不良的脑部活跃区之外，我都有加在笑话里头。

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Study leader Dr Jeffrey Johnson said more research was needed to see if depression problems in teenagers were an early phase of major depressive disorder or if minor depression earlier in life contributed to the development of more serious problems later on.

BBC: Depressed teens 'face adult risk'