One lives a happy life, the other a sad life.

一个人过着快乐的生活，另一个人过着悲伤的生活。

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Very sad and downcast were the two poor little fellows as they stood and looked at each other.

这两个可怜的小家伙站在那里，看着彼此，非常伤心和沮丧。

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They change the mood in the music either from sad to happy or the other way around.

他们在音乐中情绪从悲伤变成快乐或者相反。

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In other words, he might feel sad for saying the wrong thing.

VOA: special.2010.06.20

The difference between the extremely happy people and extremely unhappy people is not that one gets sad, of upset, or anxious, or depressed; and the other does not.

极其快乐的人和极其不快乐的人,区别不是在于一个会伤心，难过，焦虑或抑郁;,而另一个不会。

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