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.
为什么人们越来越近视？研究报告的作者们表示，近视在家族中传递，具有“高度遗传性”，但环境因素也起着非常重要的作用。
Why are people becoming more short-sighted? The Opthalmology authors say myopia runs in families and is "highly heritable" but environmental factors play an important role too.
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