理智的英文：
reason
intellect
rationality

参考例句：

In one's senses; sensibly
保持理智的

Rational Behavior.
理智的行为

the borderland between sanity and insanity.
理智与疯狂的边缘

Dealt rationally with the proBlem
理智地对待这个问题

A man without reason is a beast in season
人无理智就像是一头发情的野兽

Reason is the guide and light of life
理智是人生的响导和光辉

Life, to be worthy of a rational being, must be always in progression.
人生必须永远前进,才不愧为有理智的人。

The relation of genius to talent is the same as that of instinct to reason. ——Jules Renard
天才之于才华一如本能之于理智。——列纳尔

A small minority takes refuge in mindless radicalism.
少数人在毫不理智的激进主义里寻找安慰。

No spark had yet kindled in him an intellectual passion.
任何火花都不能激起他有理智的热情。

reason是什么意思：
n. 理由，原因，理性，理智
v. 劝说，规劝，辩论

The authority is not reasonable.
这个判例并不合理。

Reasonably adv.
适度地。

This is a potent reason.
这是一个令人信服的理由。

intellect是什么意思：
n. 智力，理解力；知识分子；有才智的人

He never brandishes his intellect.
他从不炫耀自己有多聪明。

Do the emotions develop in parallel with the intellect?
情感与智力是并行发展的吗？

He has a zest for life and a quick intellect.
他对生活充满热情，思维敏捷。

rationality是什么意思：
n. 合理性；推理力；理性

We live in an era of rationality.
我们生活在理性的时代。

They were evidently rationalizing.
他们显然是在给自己进行辩解。

She is a rational woman.
她是一个有理性的女人。