Hi, everybody. On Tuesday, I gave my final State of the Union Address. And a focus was this: how do we make the new economy work better for everyone, not just those at the top? 大家好！周二我发表了最后一次国情咨文演讲。其中

《不要抛弃学问》 Never Give up the Pursuit of Learning 导读：本文是胡适1928-1930年在上海任中国公学校长时为毕业生所作赠言，至今仍有参考价值。(注：本文译文由我国著名翻译家张培基先生完成) 当下正值毕业季，听力课堂谨以此文献给已经毕业和即将毕业的莘莘学子以共勉并祝愿各位在以后的人生之路上一路走好。 诸位同学们， Dear students of the

Here's how shape works in normal receptors. 这里展示的是形状是如何对通常的感受器起作用的。 You have a molecule coming in, it gets into the protein, which is schematic here, 一个分子进来，进到蛋白质里，图中所示意的就是蛋白质， and it causes this thin

Today at the White House, the President officially pardoned not one turkey, but two -- sparing both “Courage” and “Carolina,” a request from his compassionate（有同情心的） daughters,

You know, the mind whizzes away like a washing machine going round and round, 你们知道的，大脑（心灵）总是像一台洗衣机般飕飕运转，反反复复， lots of difficult, confusing emotions, and we don't really know how to deal with that. 许多复