Flip cards narration

Hi there.

Currently I'm working on a project whereby I am focusing on definitions.

I have tons that I need to express. It's almost like a book on terminology.

Now, I really like the flip card function but some of the definitions I am writing are quite long and I'm worried that I will lose my peers interest. I am a strong believer in voice over narration as this allows for non native English speakers to follow sentences without having to frequently check themselves everytime there is a word they can't pronounce correctly. If I can add narration to the flip card function in rise. This will give my peers a helping hand as well as give them the interactive fun through the flip cards. 

How can I get this done? Any back end or workaround assistance would be greatly appreciated.