The study also noted that when tilled soil particles come in contact with air, soil organic matter is lost through the process of oxidation.

VOA: special.2010.09.28

We'll get to oxidation number in the second half of this course, but it's not in any way the same idea as formal charge.

我们会在课程的后半部分讲到氧化数，但它和形式电荷完全不是同一个概念。

麻省理工公开课 - 化学原理课程节选

She needs to know this enzyme works by both acid base chemistry, and oxidation reduction.

她要知道酶催化，她需要知道这种酶,在酸碱环境下的反应和氧化还原反应。

麻省理工公开课 - 化学原理课程节选