I want to write a sentence where someone is speaking and in the middle of their sentence, a sound is heard, but they keep speaking after the sound is heard.

So, say a teacher is teaching a lesson and while he is speaking a student makes a burping sound but he keeps speaking.

So for example:
Teacher spoke, "In today's lession, we are [burp] going to study ancient history."

What is the proper way to write this?

Paul Sterman
Author of Children's Book: Daddy Versus the Squirrels.