当一个薄膜变得太薄时，弥散的电荷云发生交叠并相互排斥，就好象电子云交叠时两个中性原子的行为一样。
If the film gets too thin, the diffuse charge clouds overlap and repel, just as two neutral atoms do when their electron clouds interact.
氦- 3弥散磁共振成像通过检测氦原子移动的距离测定肺脏损伤。
Helium-3 diffusion MRI identifies this damage by measuring the increased distance the helium atoms move.
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