Here's scanning tunneling microscopy.

这是一张隧道扫描显微照片
This is done in a different way.

是用另一种方式拍摄的
It's not -- you don't reflect the laser light.

你并不是无需反射激光光束
What you do is detect the electrical conductivity through a layer.

你要做的是检测一层物质的电导率
And if you have an atom

如果你发现了一个原子
there that is a good conductor of electricity,

是个导电原子的话
you get more current through and less and so on.

你就会得到更大的电流反之亦然
So as you scan a real -- now this could be a really,

那么当你扫过比如说
really sharp tip where the

一个很尖锐的突起时
tip is just one atom or a couple of atoms.

尖锐到只有一两个原子宽
So now as you go across you can feel things

那么当你扫过它的时候你就能感觉到
that are much smaller laterally. Okay?

那些横向线度很小的东西