Every time when I go home by train, I feel very uncomfortable, because I have to smell the terrible air, people always smoke, making the public place smell bad.
每次当我坐火车回家，我会感到很不舒服，因为我不得不闻到令人讨厌的气味，人们总是吸烟，使得这个公共的地方闻起来不舒服。

Since the motor train operates, I feel so happy, I find the train is very clean, the air smells good, no people smoke in the train.
自从动车开行了以后，我很开心，我发现车上很干净，空气很舒服，没有人在车上吸烟。
I feel so surprised, this is the ideal environment for me, in the long journey, all the people are so polite.
我很惊奇，这对于我来说是最理想的环境了，在长途中，所有人都很有礼貌。
Smoking in the public place should be banned, the bad smell not only makes people sick, but also does harm to their health.
在公共场所吸烟应该禁止，糟糕的气味不仅仅使得人们不舒服，而且有害于人们的健康。
In the long journey, people need to keep a good environment, so they have a good mood.
在长途中，人们需要一个好的环境，来保持好的心情。