dà​zhòng​jié​yùn​xì​tǒng

mass rapid transit system

  1. the masses
    the general public; the great bulk of the population
  2. MRT
    mass rapid transit; subway system; specifically the rapid-transit systems in Taiwan
  3. system
    A whole composed of parts that work together to perform a function or achieve a goal; a series or group of related things forming a complex whole.