It does not have a mechanical keyboard and weighs less than one kilogram.

VOA: standard.2010.04.03

Why? Bundle of properties: mechanical strength, chemical inertness, ease of fabrication: that's not a unique solution.

为什么，属性的总和：,机械强度，化学惰性，易于制造，那不是独特的解决方法。

麻省理工公开课 - 固态化学导论课程节选

I mentioned previously that we do not know a lot about how the mechanical stimulation is being converted into chemical and electrical energy.

先前我曾说过,对于机械刺激到化学和电能的转换,我们还知之甚少。

斯坦福公开课 - 7个颠覆你思想的演讲课程节选

If they acted with a kind of mechanical necessity or even geometric necessity, they could not possibly be moral laws in that way.

如果这些法则有机械上,或者几何上的必须性的话，它们就不能被称作道德法则。

耶鲁公开课 - 政治哲学导论课程节选

So, what he did was kind of impose a quantum mechanical model, not a full one, just the idea that those energy levels were quantized on to the classical picture of an atom that has a discreet orbit.

还不是完整的,只是这些能级，是量子化的概念，作用到原子有分立轨道的经典原子模型上,当他做了一些计算后,他得到有个半径,他算出来。

麻省理工公开课 - 化学原理课程节选