topic

issue, subject, theme, topic

这些名词均有“主题、话题”之意。
issue: 指有争论、议论，急需讨论研究的热点话题。
subject: 一般用词，使用广泛。指书籍、文章、演讲、讨论等所隐含的、暗示的，需要由读者或听众推断的主题或中心话题。
theme: 系正式用词，多指文学、艺术作品的主题，或论文、演说的主题。
topic: 普通用词，含义广泛，但其范畴小于subject。既可指文章、讲话的题目，谈话的内容，又可指提纲中的标题甚至段落的主题或中心思想。

名词 topic:

1. the subject matter of a conversation or discussion
   同义词：subject, theme
2. some situation or event that is thought about
   同义词：subject, issue, matter

1. Lack of space forbids further treatment of the topic here.
   因篇幅所限，此处不便对本题作进一步阐述。
2. This essay is so short that it can only scratch the surface of the topic.
   这篇文章很短，只能对这一问题作肤浅的探讨。
3. The essay isn't even remotely relevant to the topic.
   这篇文章毫不切题。
4. I couldn't understand his lecture because he kept jumping from one topic to the next.
   我听不懂他的演讲，他总是从一项内容跳到另一项内容。
5. The topic centers on the crisis in these two countries.
   话题以那两个国家的危机为中心。
6. "If you can find the topic sentence, often it will help you get to the head of the paragraph, " said the teacher.
   老师说，"如果你找到主题句，它就会帮助你理解整段的中心意思。"
7. The title, subtitle, or topic that stands at the top or beginning, as of a paragraph, letter, or chapter.
   标题，题目出现在(如段落、信件或章节)顶部或开始处的标题、副题或论题
8. They discussed the weather and other topics.
   他们讨论了气候和其他的话题。