A：Well, Mike, nowadays there's much talk about nanometer. But what on earth is it?

麦克，现在好多人都在谈论纳米。它到底是个啥呀?

B：Nanometer is a length scale. It's one billionth of a meter, roughly ten times the size of an individual atom.

纳米是个长度单位。一纳米等于十亿分之一米，大概比一个原子大10倍吧。

A：Hmm...it's hard to figure out the exact size, I'm afraid.

嗯…恐怕还不太容易想像得出它的具体大小呢。

B：Well, let's make it this way. For comparison , 10 NM is 1000 times smaller than the diameter of a human hair. There are as many nanometers in an inch as there are inches in 400 miles.

这样说吧。10纳米比一根头发直径的1/1000还短。一英寸所含的纳米数量等于400米所含的英寸数。

A：I see.Thank you.

这样说我就明白了。谢谢啊。