Randomized evaluations can help us understand what works and what doesn't in development.
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。
A proof of a proposition is a process the nature of which is such as to produce in us a belief in that proposition.
The strength of liberal democracy lies in its ability to self-correct and reform.
当你错了的时候，你必须能够承认并迅速退出亏损的头寸。最糟糕的事情是抱着亏损的交易不放，希望它会回来。
The purpose of abstraction is not to be vague, but to create a new semantic level in which one can be absolutely precise.
邪恶胜利的唯一必要条件是好人的无所作为。
The P versus NP problem is one of the most important problems in computer science.