- 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.
结束语:
-In conclusion, I'd like to...
-I'd like to finish by...
-Finally...
-By way of conclusion...
-I hope I have made myself understood
-I hope you have found this useful
-I hope this has given you some idea/clear idea/an outline of...