A rational argument, explanation, solution, ETC.

合乎情理的论证、解释、解决方法等。

However, we then also brought charges on the road of rational argument.

然而，随之也带来了大家关于公路收费问题合理性的争论。

Until then it is no earthly good trying to convince him by rational argument.

迄今为止，企图用理性论证去说服他，丝毫没有用处。

Fear of physical danger is at least subject to rational argument; fear of failure is harder to hose down.

对于有形危险的恐惧至少可以通过理性论争得到克服，对于失败的恐惧则难以洗涤。

However I cannot see a rational argument for saying eating dogs or cats is barbaric while eating pork or beef is fine.

但是我认为没有令人信服的论据可以说明：吃狗肉或猫肉是野蛮的，而吃猪肉或牛肉却是正当的。