总结
-To summarize...
-Briefly, then...
-We have seen that...
-the main points, therefore, are...
-If I can summarize what I have said so far...
-If we can take stock for a moment...
-Thus we can see...
-It must now be clear that...
-I've been attempted to explain here that...
-So, to sum up...
-To recap, then, ...