命题是断言某事是或不是事实的陈述。
A proposition is an assertion that something is or is not the case.
Of the people, by the people, for the people.
In market design, simplicity often leads to better outcomes.
A good building must be able to absorb the traces of human life.
To write is to remember, but to read is to forget.
世俗的君子，如果他很穷你却说他很富，他就会发怒；如果他不义你却说他有义，就很高兴。