您要查找的是不是：
- A formal discourse on a subject, often in writing. 专题论文；专题演讲，专题讨论关于一个论题的正式讨论，常为书面形式
- To speak or write at great length on a subject; expatiate. 详述:就一个话题详细地说或写;详述
- It's quite beyond me to speak on a spacious topic like this. 我实在讲不了这般博大广泛的题目。
- I feel unqualified to speak on the subject. 我自觉无资格就此问题发言。
- Why is we spend an hour on a subject that take only 10 minute? 只需10分钟的问题，我们为什么要花1小时?
- It is impossible on Sunday,because I have to speak on a meeting. 星期日是不可能了，因为那天我得在一个会议上讲话。
- I tell him to speak on any subject he want. 我已告诉他想谈什么就谈什么。
- When elate on a subject, he could not avoid talking about it. 如果他有什么自以为得意的事情，他总按捺不住；要把它说出来。
- I told him to speak on any subject he wanted. 我已告诉他想谈什麽就谈什麽。
- A systematic, usually extensive written discourse on a subject. 专题论文关于一个主题系统的，通常是比较长的书面论文
- No student had started a search by clicking on a subject category. 没有一个学生是开始搜寻从学科类目点选。
- In printing, an unbound treatise on a subject or current topic of interest. 在印刷技术中,关于某个主题或目前感兴趣话题的一种未装订成书的论文。
- We must settle on a place to meet. 咱们得把见面的地点定下来。
- speak on a subject 谈论某个问题
- He was on a holiday break at his Texas ranch, and let his spokesman speak on his behalf. 他当时在德克萨斯州的牧场度假，他让自己的发言人代表自己讲话。
- She married a man who put her on a pedestal. 她嫁给了一个对她十分崇拜的男人。
- He is on a par with his brother in intelligence. 他在智力方面同他的弟弟不相上下。
- I always fight shy of entering into a discussion on a subject of which I know very little. 对于自己不熟悉的问题，我总是避免参与讨论。
- Mr. Smith is speaking on another telephone. Could you hold on a moment? 史密斯先生正在接另一个电话，您可以稍候一下吗?
- He is on a lone fun run, nothing to do with the race. 他自己跑著玩的，和竞赛无关。
