Note that the CMPXCHG instruction is atomic, which means that there is no intermediate visible state of the system before this instruction finishes.

注意，CMPXCHG指令是原子性的，这意味着在这个指令结束之前没有可见的中间状态。

youdao

So, if you use a black lamp or something and you excite something up to a higher energy level and then it relaxes back down to its lower energy state, it's going to emit a new wavelength of light, which is going to be visible to you.

如果你用一个紫外灯或别的,东西把某种分子激发到,更高的能级，然后它会掉回,到低能级，它就会释放,一个新的波长的光,这个光是可见的。

麻省理工公开课 - 化学原理课程节选

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