1
the whys and wherefores (of sth)
固定短语，表示‘缘由、原委’。
We need to understand the whys and wherefores of the decision.
我们需要了解决策的原因和理由。
原因；理由；缘故
先理解核心含义，再看它在真实句子里的用法。
原因；理由；缘故
the reason, cause, or intention behind something
We need to understand the whys and wherefores of the decision.
我们需要了解决策的原因和理由。
常用于 the whys and wherefores 结构中，表示“缘由、原委”。
理由。
Reason.
行为或情境背后的原因或意图,尤用于短语“前因后果”中
the cause or intention underlying an action or situation, especially in the phrase `the whys and wherefores'
The teacher explained the why of the rule before asking us to memorize it.
老师先解释了这条规则的原因，然后才让我们记住它。
It is important to examine the whys behind a decision, not just the result.
重要的是审视一个决定背后的原因，而不仅仅是结果。
Understanding the why can help you solve the problem more effectively.
理解原因能帮助你更有效地解决问题。
固定短语，表示‘缘由、原委’。
We need to understand the whys and wherefores of the decision.
我们需要了解决策的原因和理由。
较正式用法，指原因本身。
The scientist explained the why of the phenomenon.
科学家解释了现象的原因。
Not this
I want to know the why of this problem.
Use this
I want to know the reason for this problem.
Why作为名词时，通常只用于固定短语'the whys and wherefores'中。单独表示'原因'时，应使用reason，且reason常搭配介词for。
Not this
He gave me a why for his action.
Use this
He gave me a reason for his action.
Why作为名词时，不能与不定冠词a连用，因为其单独使用不表示一个具体的原因；应用reason，它是可数名词，可与a连用。
Choose the next layer that will help you use why with more confidence.
Includes Synonyms & Antonyms
Expand your vocabulary with synonyms and antonyms.
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
理由和原因
She explained the whys and wherefores of her decision.
她解释了她决定的理由和原因。
某事的原因
We must understand the why of this phenomenon.
我们必须理解这一现象的原因。
原因
The reason why he left is still unknown.
他离开的原因仍然未知。
原因和理由
She explained all the whys and wherefores of the decision.
她解释了决定的所有原因和理由。
某事的缘由
He wanted to know the why of the problem.
他想知道这个问题的缘由。
Use why naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
将'why'联想为'外'，外在的原因就是理由。
常用于书面语或解释性语境，语气偏正式。
作为名词时，常以复数形式whys出现，用于正式场合，如the whys and wherefores。
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.