Stepchildren are at greater risk because evolutionary pressures have shaped parental psychology to favor genetic offspring.

成功者与不成功者的唯一区别就是是否愿意努力工作。

Silence is the perfectest herald of joy: I were but little happy, if I could say how much.

生命周期假说认为，个人会在一生中规划其消费和储蓄行为。