在两个话题间过渡
-Having dealt with A, I now want to move on to B.
-From A, it follows that ...B
-You may have noticed that in A,…. now in B.
-As a consequence of A..., B...
-Although in A we showed..., in B...
-One exception to A is ...B
-...and this leads us to ...
-...which brings me to my next point...
-So much for A, let's look at B.
-That covers A, so what about B?
-If we're all happy with that, where do we go from here?
-As regards (X), however, the situation is somewhat different.

次要话题
-In this context it is worth mentioning...
-As an extension of this...
-It's also true that...
-One further point to add is..
-If I can digress for a moment...
-Perhaps I might also mention that...
-As an afterthought, (how, what) about...
-I will just touch on one other point in passing...
-Before we leave this subject, it's worth saying that...

回归主题
-But this is taking us away from the main theme...
-To return to the main point/subject.
-Picking up where we left off
-As I was saying before that digression/interruption.
-To continue the main discussion...
-Going back to what I was saying...
-I mentioned earlier...

阐述两个要点间的联系
-As I said earlier/before...
-You will recall that earlier I said...
-You may have been wondering why I said...
-When I was talking about this point earlier I said...
-In my introduction I said...
-Five minutes ago I said...
-You may have noticed that...
-I mentioned earlier that...
-Let me pick up a reference made earlier to...