shiyeyouyou
理由英语是reason。
例句：
1、这个结果使我们更有理由保持乐观。
This result gives us all the more reason for optimism.
2、你没有理由忧虑未来。
You have no reason to be apprehensive of the future.
3、他以精神失常为理由获判无罪。
He was found not guilty, by reason of insanity.
4、你完全没有理由不去。
There's no earthly reason why you shouldn't go.
5、我为什么要帮你？给我一个充分的理由。
Give me one good reason why，I should help you.
1144177586丫头
reason：['ri:zn]n. 理由,原因,理智,理性 v. 说服,推论,下判断请楼主采纳我！愿楼主新年快乐！巍巍你我家 神马 很高兴能为您回答，如果还有任何的疑问请尽量提出，我一定会以最快的速度回复您！(*^__^*) O(∩_∩)O哈哈~
大哈哈a呦呦
reason：理由。英汉词典的例句：by reason of 凭…的理由，因为。 by reason (that) 因为，由于。 come to reason 清醒过来。 for a reason of state 以国家的利益为理由〔指执政者的借口〕。 for no other reason than that [but this] 单单因为(这一理由)。 for reasons of 因为。 give reasons for 说明…的理由。 have reason for [to do] 有必须的理由，有理由去(做)，…(做)是对的，…(做)是当然的。 hear reason＝listen to reason. in (all) reason 合理；正当 (It is not in reason to expect me to do so. 要我做这样的事是没有道理的。
