1.

1. Now London is famous for its excellent underground service and the red double-deckers have become a symbol of the city.
    现在伦敦以它优良的地铁的服务而闻名，而且红色的双层巴士已经变成城市的一个象征。

2. The traditional red double-deckers are a symbol of London.
    传统的红色双层电车是伦敦的象征。

3. double-deckers的翻译

3. The new double-deckers, which have three doors to speed up boarding, are expected to be in service in 2012.
    新型双层巴士设有三个车门，以加快上下车速度。新型巴士预计将于2012年投入使用。

4.

4. As for coaches, they are mostly long-distance vehicles with soft seats, more comfortable than double-deckers. materials that make a soft covering for a seat.
    警察：至于长途汽车，大都是远程运载车辆，有软座骑，比双层汽车要舒服些。座位上的一块软垫子。