Here we are. One million years ago.
我们到了。一百万年以前。
It was formed around three million years ago.
它的形成时间大约在三百万年以前。
It was formed around three million years ago.
它是在三百万年前形成的。
It was formed around three million years ago.
它大约在三百万年前形成。
It was formed around three million years ago.
形成时间大约在三百万年前。
About 300 million years ago, this was a Marine salt layer.
约三亿年前，这种盐层曾是海洋。
Up until about 3 million years ago, we were covered with it.
3百万年前，我们都是披着满身毛的。
A million years ago, there were animals here before man came.
一百万年前，在还没有出现人类以前，这里就有动物。
To about 20 million years ago, Peking Man was away from here.
到约20万年前，北京猿人才离此而去。
The earliest human appeared on the earth seven million years ago.
七百万年前，地球上出现了最早的人类。
And you know, five hundred million years ago there would be no fish.
这样的话你就知道，5亿年前就不会有鱼。
SOME 16 million years ago, north became south in a matter of years.
万年前，北方在短短数年内变成南方。
The two species are thought to have split over one million years ago.
他们认为这两个物种是在100多万年前分化出来的。
But the rift did not begin to develop until around 15 million years ago.
但这条裂谷从1500万年前才开始发育。
Here's what scientists think happened, oh, about a hundred million years ago.
科学家们如是说：约一亿年前，有这么一个三恒星系。
The above scenario actually describes our experience four million years ago.
上述情况实际上说明我们四百万年前的经验。
Four hundred million years ago fish took their first 1 tentative steps onto dry land.
四亿年以前，鱼类迈出了爬上陆地的试探性第一步。
Four hundred years ago, the number was over 500 million.
四百年前，这个数量就超过了五亿。
Thirty years ago, there were half a million deaths from childbirth each year.
30年前，每年分娩死亡的产妇达50万人。
One hundred years ago, the antelope were more than one million.
一百年前，藏羚羊的数量超过一百万只。
Four hundred years ago, the population was over 500 million.
四百年前，人口只有五百多万。
Four hundred years ago, the population was over 500 million.
四百年前，人口只有五百多万。
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