【谈论主题】

The subject of my presentation is演示的主题…
I shall be speaking today about今天谈论...
My presentation concerns演示是关于…
Today's topic is今天的题目是…
During the next ten minutes, I shall接下来十分钟，我会…
Firstly, secondly, thirdly, finally…第一，第二，第三，最后