Happiness, like cholesterol level, is a genetically influenced trait. Yet as cholesterol is also influenced by diet and exercise, so our happiness is to some extent under our personal control.

• 幸福，就像胆固醇，是一种遗传特性。然而，就像胆固醇也受饮食和锻炼的影响一样，我们的幸福在一定程度上也受我们个人控制。