今天种下的每一粒种子都是对未来粮食供应的投资。
Natural experiments are a powerful tool for understanding causal relationships in the real world.
勇敢者的心永远不会被奴役。
The goal is to give everyone a voice and to help transform society for the future.
不要害怕提问。这就是你学习的方式。
写作是狗一样的生活，但却是唯一值得过的生活。
每个数学问题都有一个解决方案；有时只是需要时间去找到它。
The only way to do great work is to love what you do.