1
expound on/upon sth
常用介词 on 或 upon 引出主题。
She expounded on the theory during the lecture.
她在讲座中详细阐述了该理论。
详述；阐述；详细解释
expounds — third person singular of expound
先理解核心含义，再看它在真实句子里的用法。
详述；阐述；详细解释
to explain or describe something in detail, especially in writing
She expounded on the theory during the lecture.
她在讲座中详细阐述了该理论。
详细阐述,通常以书面形式
add details, as to an account or idea; clarify the meaning of and discourse in a learned way, usually in writing
陈述
state
expound
Base
原形
expounds
3rd person
第三人称单数
expounding
-ing
现在分词
expounded
Past
过去式
expounded
Past participle
过去分词
He expounds his theories clearly.
他清楚地阐述他的理论。
规则动词，过去式加-ed
The professor expounded her theory on climate change during the two-hour lecture.
教授在两个小时的讲座中详细阐述了她关于气候变化的理论。
Could you expound on your earlier remark so that we can understand your point?
你能详细说明一下你之前的评论，以便我们理解你的观点吗？
In her latest book, the author expounds a new approach to learning languages.
在她最新的书中，作者详细阐述了一种学习语言的新方法。
常用介词 on 或 upon 引出主题。
She expounded on the theory during the lecture.
她在讲座中详细阐述了该理论。
直接接名词作宾语，可加 to sb 表示对象。
The teacher expounded the principles of physics to her students.
老师向学生们详细解释了物理原理。
接 that 从句，用于书面或正式语境。
The article expounds that social media affects mental health.
这篇文章详细说明了社交媒体影响心理健康。
Not this
He expounded about his theory in detail.
Use this
He expounded on his theory in detail.
错误使用了介词 about，正确搭配应为 expound on/upon 表示详细阐述。
Not this
She expounded that the new policy is necessary.
Use this
She expounded on the necessity of the new policy.
误将 expound 当作及物动词后接 that 从句，应使用 expound on/upon 后接名词或疑问词从句。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
详细阐述某事
The professor expounded on his latest research.
教授详细阐述了他最新的研究。
阐述理论
In her book, she expounds her theory of language acquisition.
在她的书中，她阐述了自己的语言习得理论。
阐述观点
The article expounds the author's view on education reform.
这篇文章阐述了作者对教育改革的看法。
详细地阐述
He expounded at length on the dangers of smoking.
他详细地阐述了吸烟的危害。
阐释想法
She expounded the idea that technology should serve people.
她阐述了技术应当服务于人这一想法。
于是从摩西和众先知起，凡经上所指着自己的话，都给他们讲解明白了。（出自《路加福音》24:27）
The professor expounded on the theory for over an hour.
教授详细阐述了这项理论一个多小时。
Use expounds naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
联想expand（展开）：expound就是把你脑子里“膨胀”开来的观点摊开来详细讲，把细节都展开说明白。
语域：formal 常见场景：学术或理论文章、正式演讲或讲座 expound 通常用于正式语境，表示系统、详细地阐述观点或理论，多见于学术写作或正式演讲；日常口语中较少使用，更常用 explain。
这些词都以 -ound 结尾，与 expound 的 /-aʊnd/ 押韵：sound、found、round、ground、around、pound。注意 expound 虽以 expo- 开头，但不要与 exponent /ɪkˈspəʊnənt/、exposure /ɪkˈspəʊʒə/ 等同韵混淆，它们的读音和词义都不同。
Dictionary facts from ECDICT, WIKTIONARY.