Here is GDP per capita from 1900 to 1929. Now let's imagine that you were an economist in 1929, trying to forecast future growth for the United States, 这是人均国内生产总值从1900年到1929年。让我们想象一下，在1929年，如果你是一位经济学家
But, of course, for most of us, we know how to grow teeth, and therefore we can take adult stem teeth, put them on a biodegradable mold, re-grow a tooth, and simply implant it. 当然，我们大多数人，我们知道怎样生长牙齿，所以
We need to ensure that these wetlands and forests 我们必须保护这些湿地和森林 that are our best and greatest and most critical 它是对抗全球暖化最佳、最有利 defense against global warming are protected, 最重要的防线 and we are not rele
If you are one of the same sex couples getting married this weekend, I want to congratulate you and wish you the very best of luck. As you make your vows, you’ll be making history. Finally, after year
