数学的本质在于它的自由。
The essence of mathematics lies in its freedom.
安全不是优先事项,而是一种价值观。你无法优先考虑永远不应妥协的事情。
书籍是连接我们与过去的桥梁。
I used to think the world was broken down by tribes. Then I thought it was broken down by rich and poor. Then I thought it was broken down by stupid and smart. But I know now that it is broken down by people who are alive and people who are dead.