topic
- n. 主题（等于theme）；题目；一般规则；总论
英英释意
- 1. the subject matter of a conversation or discussion;
- "he didn't want to discuss that subject"
- "it was a very sensitive topic"
- "his letters were always on the theme of love"
- 2. some situation or event that is thought about;
- "he kept drifting off the topic"
- "he had been thinking about the subject for several years"
- "it is a matter for the police"