使变量可变很容易。控制恒定的持续时间是诀窍。
Making something variable is easy. Controlling duration of constancy is the trick.
The best leaders are those most interested in surrounding themselves with assistants and associates smarter than they are.
可持续性不仅仅是一个流行词；它是我们对后代的责任。
生活中最重要的问题，大多数情况下，实际上只是概率问题。