我不理解这个决定背后的推理。

I don't understand the ___reasoning behind this decision.

根据这条推理思路，其支持者认为，尽管运动员牺牲了大量时间，但他们赚取的巨额金钱与他们所做的工作相比是不合逻辑的。

According to this line of ___reasoning, its supporters believe that although sports people sacrifice a lot of their time, the huge amounts of money that they earn are illogical in comparison with the job they are doing.

她的推理无懈可击，导致了成功的结论。

Her ___reasoning was flawless, leading to a successful conclusion.