Life in the big city is colorful. We can always keep up with the latest fashion. We can enjoy the benefits of the latest scientific achievements in every field. We can go to any place by subway or taxi and save the trouble of walking upstairs by taking an elevator. Sometimes, without going outside, we can receive the package that we shop for online. Life in the city is so convenient that everyone loves it. 

However, there are also some disadvantages. The streets are always crowded, the air is usually polluted and there is too much noise, sometimes you can’t even sleep. The house price is too expensive that you can not even afford one in your whole life. The traffic is also a big problem. You may stuck in a traffic jam and late for work. These problems have to be solved if we still want to enjoy a better life. 

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