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Probably the happiest period in life most frequently is in middle age, when the eager passions of youth are cooled, and the infirmities of age not yet begun; as we see that the shadows, which are at morning and evening so large, almost entirely disappear at midday.

人一生中最幸福的时期大概是中年，那时青年的热切的激情冷却了，老年的疾病还没有开始;正如我们所看到的，影子在早晨和晚上都是那么大，到了中午几乎完全消失了。

— Eleanor Roosevelt 埃莉诺·罗斯福