To build is to make the invisible visible.
建造就是使不可见的东西变得可见。
The story is a vehicle to carry ideas, not the other way around.
解释：货卖完了才知道不足，是由于不懂得计量；事情结束了才知道有余，是由于不懂得调节。
The only way to deal with an unfree world is to become so absolutely free that your very existence is an act of rebellion.
代数几何是研究多项式零点的学科。
我们为新南开所抱的志愿，不过是‘了解中国，服务中国’这两句话。
我写作是为了记住，为了保持那些否则会失去的东西。
The deep, personal material of the latter half of your life is your children. You can write about your parents when they're gone, but your children are still going to be here, and you're going to want them to come and visit you in the nursing home.
Challenges are what make life interesting; overcoming them is what makes life meaningful.
Mathematics is not just about numbers, equations, computations, or algorithms: it is about understanding.