City traffic is a big problem in some cities in the world, especially in big cities. To solve the problem, someone are in favor of developing buses as means of city traffic. Others are in favor of the subway. Between them,which is the better choice?

在世界上的一些城市中城市交通是一个大问题，尤其是大城市。为了解决这个问题，有人赞成发展公交车作为城市交通的方式。另一些人则赞成地铁。在它们之间，哪个是更好的选择?

It is easier to take buses as means of city traffic than the subway trains because buses don't need special roads. But buses have also many disadvantages, some of which are very serious. They may cause louder noise and more traffic accidents. Buses give rise to serious air pollution and traffic jam. In order to stop what buses cause, a large amount of hand must be used to widen¹ the roads. On the contrary, the subway train is of more advantages. Except the difficulty and high cost of building the subway, it is superior² to the buses in many aspects.

公共汽车作为城市交通方式要比地铁容易，因为公共汽车不需要特别的道路。但是公交车也许多缺点，有些是非常严重的。他们可能会导致噪音和更多的交通事故。公共汽车也导致了严重的空气污染和交通堵塞。为了阻止公交车带来的后果，必须用大量的人力来拓宽道路。相反，地铁列车有着更多的优势。除了建设地铁的难度和高成本外，在许多方面它都优于公共汽车。

Taking the advantages and disadvantages together into consideration，I would be in favor of developing the subway train as soon as possible.

把优点和缺点一起考虑，我会赞成尽快发展地铁。