A good abstraction is one that captures the essential aspects of a concept while ignoring the irrelevant details.
Pedestrians never seem to realize that they are a threat to the safety of cars.
There are only two tragedies in life: one is not getting what one wants and the other is getting it.
生活里有两个悲剧：一个是没有得到我们想要的；另外一个是得到了。