reason用作名詞時，它的意思是：原因、理由、理解力。當reason的意思爲原因、理由時，其爲可數名詞;當reason的意思爲理智、理解力時，其爲不可數名詞。reason用作動詞時，意思有：推理、思考，常用短語有reason sth out、reason with sb。
reason的例句
1、N-COUNT 原因;理由;動機
There is a reason for every important thing that happens.每件重要事情的發生都有原因。
2、N-UNCOUNT 理由;確鑿的證據
They had reason to believe there could be trouble.他們有理由相信可能會遇到麻煩。
3、VERB 推理;推論;推斷
I reasoned that changing my diet would lower my cholesterol level.我推斷改變自己的飲食可以降低我的膽固醇水平。
4、PHRASE (常用來暗指不贊成某人的所作所爲)只有自己知道爲什麼，出於自身的理由
For reasons best known to himself, Algie changed his name.不知是出於什麼原因，阿爾吉改了名字。
