可持续发展不仅仅是保护树木；它关乎确保自然和人类共同繁荣的未来。

A shortage is a sign that somebody is keeping the price artificially lower than it would be if supply and demand were allowed to operate freely.

所有人类行为都有以下七个原因中的一个或多个：机会、自然、强迫、习惯、理性、激情和欲望。

真正的技术领导者不是跟随者，而是定义者。