<prompt> Translate the following text to EnglishJumba hilo la maonyesho lilijengwa mwaka wa 80 W.K. Lilikuwa na ngazi nne na lilikuwa na nafasi ya watu 50,000.  <response>: Built in a.d. 80, the four-tiered elliptical amphitheater seated 50,000 spectators. 