Feeling down? You're not alone. If depression seems pretty common, it is. One in every ten adults suffers from depression. And that's what has scientists puzzled. If depression is a detrimental condition, why is it so rampant in the population?
你有感到很失落吗？并不是只有你这样。抑郁看起来很普遍，事实上也是如此。每十个成年人里就有一个会患有抑郁症。这让科学家们感到不解。如果抑郁对身体有害，那么为什么人群中抑郁症患者如此之多呢？