There is no rational explanation for his actions.
对他的所作所为无法作出合理的解释。
I don't know why though, there is no real rational explanation.
我不知道为什么，这里没有一个真正合理的解释。
Since Lucas mentioned this point at 1990, there are various ways to be discussed about this point. But there is no rational and available explanation for this idea as yet.
自卢卡斯(1990)提出该问题以来，经济学界对此进行了广泛的研究，虽然仍然没有得出完全令人信服的解释。
Since Lucas mentioned this point at 1990, there are various ways to be discussed about this point. But there is no rational and available explanation for this idea as yet.
自卢卡斯(1990)提出该问题以来，经济学界对此进行了广泛的研究，虽然仍然没有得出完全令人信服的解释。
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