这一术语是指某一地区疾病的传播，而非疾病的严重性。
The term refers to where an illness spreads, not its severity.
我们抱怨疾病，并不能缩短疾病的时间，也不能降低疾病的严重性。
The illness we complained does not decrease the time. And the gravity of the illness does not reduced.
较早的治疗能降低精神疾病的严重性，即一旦爆发且未经治疗直到发生危机。
Early intervention, in turn, can reduce the ultimate severity of mental health conditions that would otherwise rage on, untreated, until a crisis occurred.
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