reason
[5ri:z(E)n]
n.
原因；理由；动机
The reason she was ill was that she had eaten bad meat.
她生病的原因是她吃了变质的肉。
The reason for this is that this plane is also a bicycle.
"其原因是,这架飞机又是一辆自行车。"
理性；理智；道理；判断力
There's a great deal of reason in his advice.
他的忠告极有道理。
"There are reasons for this great interest in the ideas, feelings, and actions of youth."
"对年青人的思想、感情和行动发生这样巨大的兴趣,自有它的道理。"