Hi, everybody. 大家好！ About a year ago, I promised that 2014 would be a breakthrough year for America. 1年以前我曾向大家许下承诺，2014年是美国的突破之年。 And this week, we got more evidence to back that up. 而本周我们如约履行了这个承诺，有了
4.Gettysburg Adress 4.林肯葛底斯堡演讲 Four score and seven years ago our fathers brought forth on this continent, a new nation, conceived in Liberty, 八十七年以前，我们的祖先在这大陆上建立了一个国家，它孕育于自由， and dedicated to the pro
It's a lot of money for Lauren and a lot of money for her family. 对于Lauren,对于我们的家人来说，这些钱是一笔大数目。 It's called living better. 这些钱被她视为"更好的生活"。 As Lauren says, "every little bit helps." And this is more th
DNA is the fundamental molecule the carries genetic instructions that help build the living world. DNA是携带遗传指令最基本的分子，帮助建造了生机勃勃的世界。 Humans have DNA. Pigs have DNA. Even bacteria and some viruses have DN
