In this thesis, the author first pointed out the free redical reaction.

在这篇论文中，作者首先指出了自由基反应。

In this thesis, the author first pointed out the cause m which decarboxylation can happen and then Sammarized the Mechamsms of ionic reaction and free redical reaction.

首先指出脱羧反应发生的原因，继而论述其反应的历程——离子型反应和游离基反应历程。