各类在线翻译服务都不太准确，求懂英语的人士帮忙连贯的翻译出来：
我市是一个拥有700万人口的大城市。城市交通拥堵一直是困扰我们的一个难题。造成我市交通拥堵的主要原因如下。一是历史原因造成的道路狭窄，布局不合理；二是城市交通管理手段落后，管理水平低；三是公共交通满足不了城市大众的乘车需要；四是市民自觉维护城市交通的法制意识差，违规占道，违规穿行现象严重。因此，要解决我市的交通拥堵状况，必须动员全市方方面面的力量，共同努力才能奏效。
My city is a big one with a population of 7 million. The traffic jam is a problem troubling us all the time. The cause of the jam is as following:
Due to the historical reason, the roads are very narrow with an unreasonable layout.
The administration means is falling behind and the management level is low.
The public transport can not meet the needs of the citizens who want to take the public transportation.
The citizens are lacking of the awareness of the law concerning the maintenance of the city traffic. occupying the road and crossing the road at will are very serious.
Therefore, in order to solve the problem of the traffic jam in our city, we must mobilize the power of the whole society. Only the combined efforts can the target be achieved!
供参考。