就我个人而言，我认为贵方的还盘是有道理的。但我必须与总部联系一下，明天通知您。 Personally, I think your counter- offer is reasonable. But I must contact my headquarter first and I'll inform you tomorrow.
依我看，他说的话是有道理的。 From where I stand, what he said is reasonable.
我认为这是没有道理的。 I think that's not reasonable.
把钱花在不需要的东西上是没有道理的。 There's no logic in spending money on things you don't need.
