reasonable名词形式

名词形式是reason，意思是原因，理由，例如：

1.There was much discussion about the reasons for the failure.就失败的原因进行了大量的讨论。

2.For some reason we all have to come in early tomorrow.出于某种原因，我们大家明天都不得不早点来。

3.The principal reason for this omission is lack of time.跳过它的主要原因是时间不足。