I have called this principle, by which each slight variation, if useful, is preserved, by the term Natural Selection.  

心理现象最好从其功能角度来理解。

艺术是自由的女儿。

Trust is the currency of collaboration, and it must be earned every day.

The most dangerous threat to democracy is the erosion of trust in institutions.

我们写作不是因为我们想写，而是因为我们不得不写。

可靠性的代价是追求极致的简洁。

Leadership in times of change requires both vision and the courage to make difficult decisions.