What is the technical premise of the construction of the small miracle "battlefield hospital" in Civilization 3?

At least five cities have hospitals.

Of course, we must first study the technology of "modern medical care"

Build a hospital

Its rules are similar to those of Wall Street.

This technology allows you to build a hospital after research.

This is the technology of the industrial age.

If it meets the requirements of creating a small miracle.

There will be hints in the game.

Small miracles are not unique.

Every player or computer can create it.