Now, in the early days of my lecture, when I used to talk about risk, that is all I would say. 在我早先的演讲中，当我谈到风险的时候，我就只讲上面这些就够了。 But people would sometimes try to ask me a question during the Q&A pe

So the idea of mastery learning is to do the exact opposite. 然而掌握式教育的观念就是反其道而行之。 Instead of artificially constraining, fixing when and how long you work on something, 将人为的限制、僵化、何时学习和学多久、 pretty much e

Hello, everybody. It is very good to be with you here today, and particularly to be able to thank you all for the work that you do on behalf of the government and on behalf of the British people. Vita

Hi everybody. Right now, the United States Senate is debating a bipartisan（两党连立的）, commonsense bill that would be an important step toward fixing our broken immigration system. It's a bill that would

At the same time, the terrorist threat has evolved, as we've seen so tragically from Boston to Chattanooga, from San Bernardino to Orlando. 同时，恐怖威胁的方式也在变化，我们见证了从波士顿到查塔努加，从圣贝纳迪诺到奥兰多这些悲剧。 So in Afgh