This short documentary shows how a city's water supply is purified at a filtration plant. The complex system of the underground mains that supply all...
Mugt çäklendirilmedik giriş, Reklama ýok zady gözläň, Her gün millionlarça at we goşuldy, Platformhli platformalar we doly optimallaşdyrylan, Islendik ýerde we islendik wagt