advantages and disadvantages
   
Among disadvantages of living in big cities, air pollution, traffic jam, and the high living cost are three main disadvantages.
    Most big cities attract a lot of domestic investments as well as foreign investments inside and outside country, so the number of factories is increasing fast. This makes the air extremely polluted by smoke from factories, trucks, and motorbikes.
    As a result,there are more and more people get many serious diseases, such as lung cancer, tuberculosis and so on.
   Another disadvantage is traffic jam. There are a lot of people and transports in big cities, so traffic jam is an unavoidable problem. People can not go to work on time because they are always stuck for hours in rush hour.Besides, transport system which is stuck will cause a lot of serious problems. For example, ambulance and fire engine can not get in time to complete duty, so there is a big loss of humans and property. It also takes a lot of money of producers when their goods do not get in time.
   the cost of living in big cities is very high.Nowadays, the development of big cites is faster and faster, so these big cities become big economic centers of country. Because of that, public services such as health service, postal service, etc cost a lot. It will be difficult for the poor and workers to live in big cities because they have to pay too much for public services while their salary is too low
   In conclusion, with these main disadvantages, living in big cities needs to be considered carefully.

   Trong số các nhược điểm của đời sống tại các thành phố lớn, không khí ô nhiễm,ách tắc giao thông, và chi phí sinh hoạt cao là ba nhược điểm chính.
   Hầu hết các thành phố lớn thu hút nhiều đầu tư trong nước cũng như nước ngoài , do đó số...