The subway a line, breathe out city person you are not easy! See kind of subterranean building what

Through tight construction of 3 years, traffic of Huhhot city orbit open adjustment couplet tried a line July 5 the job. Adjustment couplet tries a process in, will wait for each equipment to have a test stage by stage to net of orbit of along the line, contact, communication, signal, adjust, decide each system reachs level of enlightened and earlier operation.