很简单,两者都表理由或原因。

reason着重指解释或说明某事发生的理由或原因,

thecauseof着重指产生或造成某事发生的原因,往往指造成不好的影响。下面见两个例子：

1.The reason for which he was late was that he got up late.

2.The cause of the accident was his carelessness.

thecauseof翻译为······的原因

reason翻译为理由。