The world is full of signs, but we have forgotten how to read them.
解释:货卖完了才知道不足,是由于不懂得计量;事情结束了才知道有余,是由于不懂得调节。
The climate system is extraordinarily complex, and our understanding of it is still evolving.
Other holidays repose upon the past; Arbor Day proposes for the future.