To be of use to the world is the only way to be happy.
对这个世界有所助益是获得快乐的唯一途径。
You have to fight through some bad days to earn the best days of your life.
解释：礼仪和敬重是立身处世的基础。
因果模型是数据与决策之间的桥梁。
The liberal democratic system may not be perfect, but it is the best system we have.
Two roads diverged in the wood and I took the one less traveled by, And that has made all the difference.