为了我们的城市变得更好，我建议：控制汽车的数量，不要盖那么多卖不出去的房子，关闭有污染的工厂，恢复大连的自然环境。
For our city to become better, I suggest: control the number of cars, do not build so many houses that cannot be sold, Shut down polluting factories, to return to the natural environment in Dalian.
库德拉检测了城市污水处理工厂的样本，并没有发现高难度的尿素。 但是曽有化粪池泄露污染切萨皮克湾和墨西哥湾。
Sewage-treatment plants tested as part of Kudela's study did not discharge much urea, but leaky septic tanks have been known to dump urea into the Chesapeake Bay and the Gulf of Mexico.
一般来讲，有工厂的地方空气污染都会很严重。
Generally, air will be heavily polluted where there are factories.
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