The decline in the intensity of light can lead to Seasonal Affective Disorder (SAD) and blue/green and full-spectrum light are used in phototherapy, an effective cure for winter depression.

光照密度减少可以导致季节性情绪障碍（Seasonal Affective Disorder），使用蓝绿光和全谱光线进行照射（光线疗法）可以有效的治疗冬季抑郁症。

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So this is not -- this was not a full cure for what ailed our economy.

WHITEHOUSE: Press Briefing

But this is not necessarily a negative trend, because new treatments - although not providing a cure - are allowing those with the virus to live much longer before contracting full-blown Aids.

BBC: US HIV cases 'on the rise'

Prevention is almost certainly cheaper than cure: a violent, half-deserted estate could end up costing more than a full and peaceful one.

ECONOMIST: Housing estates