人们越来越清楚的认识到，性格和才智，至少部分是具有遗传性的。 所以假设乐观与悲观的倾向在某种程度上通过基因传递着。
That personality, along with intelligence, is at least partly heritable is becoming increasingly clear; so, presumably, the tendency to be happy or miserable is, to some extent, passed on through DNA.
悲观的性格 .
虽然性格很难改变，精神疗法和感知行为疗法也许可以帮助那些发现自己具有极度悲观主义和影响日常社交的社交隐避症的人。
While personality can be tough to change, psychotherapy and cognitive behavioral therapy may help those who find that their extreme pessimism or social withdrawal affects their daily functioning.
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