BRT, which is short for Bus Rapid Transit, is c “the underground system on the ground”. It has been in s since October 1st , 2012 in Lian Yungang. In the p____, the roads in the city were so crowded（拥挤的）that most buses went slowly. Because of this, the city government decided to build BRT. Now, people can go to work by it more ethan before. And if you have a student card, you can have a discount on the t    .