And originally it was a math problem more or less. 最初它差不多只是一个数学问题的游戏。 Like, here's the economics of illegal immigration. 就像，关于非法移民的经济学问题。 And the more I learned about the Mexican culture my partne

Hi, everybody. This week, we made it official—I'm going to Cuba. 大家好。这个星期，我们正式决定，我即将出访古巴。 When Michelle and I go to Havana next month, it will be the first visit of a U.S. president to Cuba in nea

TED演讲：是什么造就了长城的无与伦比，好好学习下，下次向外国朋友介绍的长城的话就不会没有话说了。A 13,000 mile dragon of earth and stone winds its way through the countryside of China 一条1万3英里的土石之龙蜿蜒于中国乡野之间， with a history almost as long and serpent

Hello everyone, I'm Michelle Obama, and on this Mother's Day weekend, I want to take a moment to honor all the mothers out there and wish you a Happy Mother's Day.I also want to speak to you about an

I grew up in Northern Ireland, right up in the very, very north end of it there, 我从小在北爱尔兰长大，就在爱尔兰岛的最最北边 where it's absolutely freezing cold. 那里非常冷 This was me running around in the back garden mid