勒文森说，“悲伤是一种很有用的情绪。

Sadness “is a very functional emotion, ” Levenson says.

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勒文森称，总体说来，一个人可以在非常快乐的同时有强烈的悲伤情绪回应，这看似合情合理。

And it's plausible that overall, a person can be very happy and at the same time have a strong sadness response, Levenson says.

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这种悲伤情绪更敏锐的原因之一可能是老年人经历过更多的悲欢离合，对悲伤更为敏感。但是勒文森并不这么认为。

One reason for this keener sense of sadness might be that older people have experienced more losses and might be sensitized to sorrow, but Levenson doesn't think so.

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