实际上正如上面Pickens的例子证明，全球经济减退会对环境带来不良后果，因为那些能提高环境质量的经济活动在全球经济衰退中受到了抑制。
Actually, as the Pickens example proves, global economic downturns take a toll on the environment by restraining economic activity that could improve the situation.
但是平均五年之后，那些积极参与社交活动的老人则降低了认知力减退的比率。
Over an average of five years, however, those who were more socially active showed reduced rates of cognitive decline.
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