然而在中年时期，大多数人的快乐感和生活满意指数降低了。
In the middle however most people's happiness and life satisfaction levels drop.
总体生活满意度随个人与国家收入的增加而提高，从中向我们揭示，社会环境对生活的满意指数起着非常重要的作用。
Overall satisfaction with life went up with both personal and national income, suggesting societal circumstances play an important role in happiness.
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