盾构施工技术在我国重大地下工程的应用越来越广泛，已经成为了城市地下铁道建设的主要方法。
With the wide use of Shield tunneling method in important substructure works in our country, it has become a major method applied in city subway construction.
这些地下铁道必在改善中国城市交通环境、缓解城市交通拥挤、减少城市污染等方面起到积极的作用。
It is unquestionable that the subways will play a positive role in the respects of improving the urban traffic conditions, alleviating the traffic jams, reducing the pollutions.
发明内容有广告的轨道车辆外壳，但不包括现有的城市有轨公交电车、现有的地下铁道列车。
The railway vehicle housing the contents of which are advertisements is invented, but the present urban track bus trolley and the present subway train are not included.
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