预测未来的最好方式就是创造未来。
Letters are the biographer's gold mine; they reveal what official records conceal.
Every seed we plant today is a promise to future generations.
逝者从未真正离去,他们活在我们讲述的故事中。
效率是把事情做对;效能是做对的事情。
The probability of a response is determined by its reinforcement history.