It is no longer a major economic center of china
Though some typical qualities of a successful prototype are that it: Illustrates the real-world functionality of the product (and whether it needs to be fine-tuned). Shows how the product fits and interacts with other pieces or components (and whether design or dimensional adjustments are required).????
Because seamounts rests on the pacific plate and they also move because of resting on the Hawaiian hotspot drift.
Teotihuacan is an ancient American city and currently an archeological site in Mexico, close to Mexico City.
The city was ancient even to the Aztecs who, like us, only saw the ruins of the city (the name was given by the Aztecs and we don't know what the original inhabitants of the site called it).