A glass of water for drip a drop of sewage and dirty, a cup of water is not clear because of the existence of a drop of water.

一杯清水因滴入一滴污水而变污浊，一杯污水却不会因一滴清水的存在而变清澈。

13'

上期传送门

希望大家能把它当做自己的人生格言！下期再见！！！