a 这么说伦敦的交通比北京的状况要好一些了？

　　b yes, it is better.  london has a bigger underground, or metro system.

　　b 是的，好一些。伦敦的地铁系统要大一些。

　　a that must help.  less people in cars.

　　a 那会缓解交通问题。开车的人少了。

　　b yes.  and the bus system and train system are really good.

　　b 是的。公共交通系统和铁路系统非常发达。

　　a so i guess you have fewer cars, less traffic . . . and less pollution than beijing.

　　a 所以我想你们的私家车少，车辆少…污染比北京小。

　　b yes.  i think beijing needs more buses, trains and metro trains.

　　b 是的。我想北京需要更多的公共汽车、火车和地铁。

　　notes 注释

　　1 remember you can use comparative adjectives to compare things, e.g. the traffic situation is better in london than in beijing. / the traffic situation is better in london than in beijing; london has a bigger metro system. / london has a bigger metro system; you have fewer cars, less traffic and less pollution. / you have fewer cars, less traffic and less pollution.

　　记住你怎样用形容词的比较级比较不同的事物，例如：the traffic situation is better in london than beijing /伦敦的交通状况要比北京好一些; london has a bigger metro system. /伦敦的地铁系统要大一些; you have fewer cars, less traffic and less pollution. /你们的私家车少，车辆少，污染小。

　　2 when you want to describe a need, use need/need or needs/needs, e.g. beijing needs more buses and trains. / beijing needs more buses and trains.

　　当你想描述某种需要时，用need/需要 或者 needs/需要,例如：beijing needs more buses and trains. /北京需要更多的公共汽车和火车。