1
be rational
“rational”作形容词，常与系动词连用，表示“合理的”。
His decision was rational.
他的决定是合理的。
理性的；合理的
先理解核心含义，再看它在真实句子里的用法。
理性的；合理的
based on reason or logic; sensible; reasonable
His decision was rational.
他的决定是合理的。
有理性的
Capable of reasoning.
逻辑上合理的
Logically sound; not self-contradictory or otherwise absurd.
符合或基于理性或使用理性
consistent with or based on or using reason
理智的
Healthy or balanced intellectually; exhibiting reasonableness.
It is important to make rational decisions based on facts rather than emotions.
基于事实而非情感做出理性的决策是很重要的。
AI contextual example
She gave a rational explanation for her sudden resignation.
她对自己突然辞职给出了一个合理的解释。
AI contextual example
In a crisis, staying calm and rational can help solve problems more effectively.
在危机中保持冷静和理性有助于更有效地解决问题。
AI contextual example
rational behavior
理性行为。
WordNet
“rational”作形容词，常与系动词连用，表示“合理的”。
His decision was rational.
他的决定是合理的。
使用形式主语it，后接不定式。
It is rational to save money for emergencies.
为紧急情况存钱是理性的。
“rational about”表示“在…方面理性”。
She is very rational about her career choices.
她对职业选择非常理性。
Not this
We need to rational this problem.
Use this
We need to rationalize this problem.
中文学习者常误将形容词 rational 用作动词，但英语中动词形式是 rationalize（使合理化）。
Not this
It's not rational to ask for a discount.
Use this
It's not reasonable to ask for a discount.
Rational 侧重基于逻辑的理性，而 reasonable 强调公平或可接受。在请求折扣的语境中，应用 reasonable。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
理性思考
We need to engage in rational thought to solve this problem.
我们需要进行理性思考来解决这个问题。
理性决策
She made a rational decision based on all the facts.
她根据所有事实做出了理性决策。
理性行为
His rational behavior calmed everyone down.
他的理性行为让大家都平静下来。
合理解释
The scientist provided a rational explanation for the phenomenon.
科学家对这种现象给出了合理解释。
有理数
All integers are rational numbers.
所有整数都是有理数。
理性方法
A rational approach to the problem is essential.
对这个问题采取理性方法至关重要。
理性的人使自己适应世界；非理性的人坚持试图使世界适应自己。因此，所有的进步都依赖于非理性的人。
In his famous quote, Shaw contrasts the rational man who conforms with the irrational man who drives change.
在他的名言中，萧伯纳将顺应世界的理性人与推动改变的非理性人进行了对比。
我没有被编程去感受，但我能够进行理性思考。
Data's statement highlights that rational thought is independent of emotion.
数据（Data）的陈述强调了理性思考独立于情感之外。
Use rational naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
Rational 里有 ratio，有理数就是比例。
语域：neutral 常见场景：academic writing、rational argument、mathematics 该词多用于正式或学术场合，表示基于理性或逻辑，也可表示有理数。
Words like 'national' and 'fractional' rhyme exactly with 'rational' (same stressed vowel /æ/ and ending /ʃənəl/). 'Irrational' looks similar but has stress on the second syllable /ɪˈræʃənəl/, so it does not rhyme.
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.