\"机理\"的英文是什么?

mechanism

An instrument or a process, physical or mental, by which something is done or comes into being:

办法,途径:用来制造某事物的工具或者事物产生的物理过程或精神过程:

The sequence of steps in a chemical reaction.

(化学反应的)过程:化学反应的一系列步骤