reason, cause区别
(1) reason：理由，原因;指决定做某一件事或采取某一行动的理由，由此而得出结论或解释。
The reason for my absence was that l was ill. 这儿不能用because引导。
(2) cause：起因；指引起某种后果的起因。
The cause of the accident was the fact that he was driving too fast. 事故的起因是他开得太快。
