Was it a)150,000 years ago? b)2 million years ago? or c)5 million years ago?

是在a)15？b)200？是c)500？

Dinosaurs have been extinct for millions of years.

恐龙已经灭绝几百了。

You can't be too careful these days.

是小心驶得船啊。

Was it a) 150,000 years ago? b) 2 million years ago or c) 5 million years ago?

是在a)15？b)200？是c)500？

450,000 years old, 4.5 million years old, 4.5 billion years old or 4.5 trillion years old?

45、450、45是4.5呢？

Cereal processing has a history of over 10,000 years.

谷物加工的历史已有上。

But what about 10,000 years in the future?

但未来一后呢？

I hope you enjoyed the last 10,000 years.

希望你们享受最后一。

Dinosaurs died out about 65 million years ago.

大约6500恐龙灭绝。

Early humans then left Africa between 60,000 to 70,000 years ago.

早期人类在6至7离开非洲。

What happened about 250 million years ago?

两五千发生了什么？

Modern humans arose in Africa about 200,000 years ago.

现代人类大约在20出现在非洲。

Here it is better to say " better safe than sorry" .

在这里，说" 小心驶得船" 会更好些。

It takes 10,000 years to wear away an inch of granite.

按一英尺花岗岩耐磨一计算。

In geologic time, a million years is recent history.

在地质学角度看来，一百属于近代历史。

Simbakubwa was a member of an animal group that appeared 62 million years ago.

非洲巨狮是6200的一类物种。

This tusk is over 30,000 years old.

这只象牙已经有3的历史了。

Collagen probably cannot last longer than that.

胶原蛋白可能不能存在超过一。

And then waiting for what felt like millions of years.

假装它等了几百。

And they think that happened roughly 200,000 years ago.

他们认为那大概发生在20。