- I’m going to be speaking about something that is vitally important to all of us.

　　- My presentation will help solve a problem that has puzzled people for years...

　　- At the end of this presentation you will understand why this company has been so successful for so long...

　　- I am going to be talking about a product that could double your profit margins...

　　- the next ten minutes will change your attitude to sales and marketing...

　　- Over the next ten minutes you are going to hear about something that will change the way your companies operate...

　　- By the end of this presentation you will know all there is to know about...

　　告诉听众内容要点

　　- there are five main aspects to this topic (...the first, ... the second, ...a third, ...another, ... the final)

　　- I am going to examine these topics in the following order (...first, ...next, ...after that, ...finally)

　　- I’ve divided my talk into five parts...

　　- I will deal with these topics in chronological order...

　　- I’m going to start with a general overview and then focus on this particular problem (...in general, ...more particularly).

　　- I want to start with this particular topic, and then draw some more general conclusions from it (...specifically, ... in a wider context).

　　- there are (a number of) factors that may affect...

　　- We have to take into account in any discussion of this subject, the following considerations.

　　- We all ought to be aware of the following points.