随机评估可以帮助我们了解发展中哪些措施有效，哪些无效。

I don't make music for the critics, I make it for the fans.

Failure is just a temporary setback, not the end of the road.

The real moral test of a society is how it treats those who are at the dawn of life, the children; those who are in the twilight of life, the aged; and those who are in the shadow of life, the sick, the needy and the handicapped.

细节不仅仅是细节，它们成就了产品。