Expanding on Your / Others' Comments

Also,

Analogously,

And another thing,

And not only that,

Besides,

Building on that,

For example,

Furthermore,

I can see what you're saying, but...

In keeping with the party line,

Moreover,

Not to mention the fact that

Plus the fact that

To elaborate on that,

To expand on that,

To piggyback on what Mary just said

What's more,

Within this same framework,