topic
英 ['tɒpɪk]
美['tɑpɪk]
	    - 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"