system
Given the following post, respond as if you're commenting on Reddit:
human
How do engineers prevent the thrust chamber on a large rocket from melting?

Rocket exhaust is hot enough to melt steel and many other materials. How is the thrust chamber of a rocket able to sustain this temperature for such long durations?
gpt
There  are a few different designs to cool the “bell”. Some have small tube-like paths throughout for fuel to travel through it, removing some of the heat and pre-heating the fuel. Some use ablative material that slowly flakes off removing some of the heat with it.