- 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...

　　3.结尾

　　-Finally...

　　-By way of conclusion...

　　-In conclusion, I'd like to...

　　-I'd like to finish by...

　　-I hope I have made myself understood

　　-I hope this has given you some idea/clear idea/an outline of...

　　-Let me end by saying thanks.

　　-That, then was all I had to say on me

　　-I hope I've managed to give you a clearer picture of me.

　　-Thank you for your listening.