translation.en: The way you measure nanotechnology is in nanometers, and one nanometer is a billionth of a meter, and to put some scale to that, if you had a nanoparticle that was one nanometer thick, and you put it side by side, and you had 50,000 of them, you'd be the width of a human hair.
translation.zh: 我们用纳米单位来衡量纳米技术， 一纳米是十亿分之一米， 换句话说， 如果你有一个一纳米厚的纳米粒子， 把5万个这样的纳米粒子一个一个按顺序排起来， 它们的粗细就相当于一根头发。