translation.en: So light and oxygen are polar opposites from one another from a chemical point of view, and if we can control spatially the light and oxygen, we could control this process.
translation.zh: 所以从化学角度看， 光和氧气的作用彼此对立， 我们要是能立体地控制光和氧气， 我们就可以控制制作过程。