reason
单词辨析：
指某事发生的原因或做某事的正当理由，常后接介词 for 及 why 或 that 引导的从句，作“理由”解时还可后接动词不定式。
She gave her reason for being late.
她说出了迟到的原因。
He refused to explain the reasons behind his decision.
他拒绝解释为何作出这个决定。
We don't know the reason why she didn't come home.
我们不知道她为什么没回家。
He has reason to feel happy.
他有理由感到高兴。
指导致某事发生的行为、事件等；也指产生某种感情或做出某种举动的正当理由，作此义解时常可与 reason 换用。
Lack of physical exercise is the leading cause of obesity in young students.
缺乏体育锻炼是青少年学生肥胖的主要原因。
What was the fundamental cause of this failure?
这次失败的根本原因是什么？
There is no cause/reason for anxiety.
不必焦虑。
指辩解的理由或推脱的借口，常后接介词 for。
She always has an excuse for being late.
她总是能为自己的迟到找理由。
What is your good excuse for not coming?
你没来有什么正当理由？
指做某事的正当理由，作此义解时通常用复数。
She gave good grounds for divorce.
她给出了充分的离婚理由。
Did the police have reasonable grounds to file a lawsuit against that company?
警方有充分理由起诉那家公司吗？
相关例句：
'Listen,' I reasoned, 'it doesn't take a genius to figure out what Adam's up to.'
“听着，”我分析道，“要弄清楚亚当想要干什么很容易。”
There is a reason for every important thing that happens
每件重要事情的发生都有原因。
It means working, within reason, for whatever time is necessary.
这意味着在合理的范围内花费所有必要的时间工作。
For no reason at all the two men started to laugh.
两个人莫名其妙地开始大笑。
For some inexplicable reason she was attracted to Patrick.
因为某些无法解释的原因，她被帕特里克所吸引。
The company's top executives had refused to listen to reason.
公司的高层管理人员拒绝理智行事。