Think for a moment about your car. 就拿你的车来说。 It has thousands of parts, from the foam that makes the seats to the electrical wiring to the light bulbs. 它由数千个零件组成，从座椅的海绵，到电线，到灯泡。 And for many of those p

I'm not even telling you the story because I think we should be running more carefully controlled randomized trials in all aspects of public policy, 我跟你说这个故事也不是因为我认为，我们在公共政策的各个方面，做随机抽样试验时，应该更小心， altho

If there's a building down the block which is being demolished, are there materials there that the new building being built here can use? 如果不远处有一栋楼正在被拆毁，拆下来的这些材料中有没有一些是这边的新建筑物可以使用的？ Can we use that, t

TED Technology, Entertainment, Design在英语中的缩写，美国的一家私有非营利机构，以它组织的TED大会著称；将"用思想的力量来改变世界"作为宗旨。事实上，除了科技、娱乐、设计的主题，这场盛会涉及的领域还在不断扩展，展现着涉及几乎各个领域的各种见解，TED的演讲简短且深刻，参加者们称它为 “超级大脑SPA”。 The "Dirty Jobs" crew and I

THE PRESIDENT: Good morning. I'm speaking to you from Beijing, where I've come to support American athletes participating in the Olympic Games. This is a moment of pride for our Olympians and the grea