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excursus on + topic
excursus 常接介词 on 或 into，表示离题讨论的话题。
The book contains an excursus on medieval medicine.
这本书包含一篇关于中世纪医学的附记。
补论；附注；专题论述
先理解核心含义，再看它在真实句子里的用法。
补论；附注；专题论述
A fuller treatment, in a separate section, of a particular part of the text of a book, especially a classic.
The book contains an excursus on medieval medicine.
这本书包含一篇关于中世纪医学的附记。
对书中某一部分(尤指经典著作)的详细论述(通常作为单独章节)。
A fuller treatment (in a separate section) of a particular part of the text of a book, especially a classic.
叙事中的离题话,尤指讨论某一特定问题。
A narrative digression, especially to discuss a particular issue.
In academic works, the author sometimes includes an excursus to discuss related topics.
在学术著作中，作者有时会加入一个附记来讨论相关话题。
His speech contained a lengthy excursus that confused the audience.
他的演讲中有一个冗长的离题话，让听众感到困惑。
The appendix of the book includes an excursus on the historical background.
这本书的附录包含一个关于历史背景的补说。
excursus 常接介词 on 或 into，表示离题讨论的话题。
The book contains an excursus on medieval medicine.
这本书包含一篇关于中世纪医学的附记。
用于指代作品中的离题部分。
In an excursus, the author explains the background of the myth.
在一段离题话中，作者解释了神话的背景。
Not this
He excursused from the main topic for several minutes.
Use this
He went on an excursus from the main topic for several minutes.
英语中 excursus 是名词，不能误用作动词。应使用 'go on an excursus' 或类似结构。
Not this
We planned an excursus to the beach for the weekend.
Use this
We planned an excursion to the beach for the weekend.
Excursus 意为 '离题话' 或 '附记'，而 excursion 才是 '短途旅行'。因拼写相似而混淆，需根据意思区分。
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页面下方列出了常见词形变化。学习时注意它们在句子中的语法位置。
Dictionary facts from ECDICT, WIKTIONARY.