Every time when i go home by train, i feel very uncomfortable, becaue i have to mell the terrible air, people alway moke, making the public place mell bad. ince the motor train operate, i feel o happy, i find the train i very clean, the air mell good, no people moke in the train. i feel o urpried, thi i the ideal environment for me, in the long journey, all the people are o polite. moking in the public place hould be banned, the bad mell not only make people ick, but alo doe harm to their health. in the long journey, people need to keep a good environment, o they have a good mood.