The Great Depression was the defining macroeconomic event of the twentieth century, and it led to a fundamental rethinking of macroeconomic theory and policy.
大萧条是二十世纪的决定性宏观经济事件，它引发了对宏观经济理论和政策的根本性重新思考。
一个奇怪的事实是，根据从生物学或地球物理学的角度出发，对地球史前条件会得出完全相反的结论，这反映了我们目前知识的不完整状态。
The great advantage of old age is that you can be as rude as you like.
对验证的渴望是可以理解的，但并不总能得到满足。
In order to achieve independence, we must rely on our own strength.
随机评估可以帮助我们了解发展中哪些措施有效，哪些无效。