Let me make a comparison directly between the United States of America and Vietnam. 现在我们对比一下美国和越南。 1964. America had small families and long life; Vietnam had large families and short lives. 1964年的美国家
So what were these ancient -- I mean, they're ancient, they're foreign, but they're at the same time somehow familiar. 因此这些古老的--我是说，它们是古老的，异域的，但同时它们也是我们熟悉的。 What were these artifacts for? 这些人工制品的用途是什么
Each year more than 100,000 high school graduates, with proved ability, do not enter college because they cannot afford it. And if we cannot educate today's youth, what will we do in 1970 when ele
But to put that in context: 我们把这些数字写下来： 5.93 million years ago 593万年前 was when our earliest primate human ancestors stood up. 我们人类的祖先灵长类开始了直立行走 That was the first upright primate. 这是第一种直立行走的灵长类动物 Okay
