With the attention increasingly given to environmental pollution, restriction of diesel engine emission in many countries is becoming more and more rigorous.
随着人们对环境污染重视程度的提高，世界各国对柴油机排放的限制也日益严格。
We found that the best help for the urban ecosystem would be the restriction and prohibition on the use of motor vehicles, because their exhaust emissions are the majority of current urban pollution.
我们发现就目前大多数城市的环境污染多数来自汽车尾气的排放量过大，那么从汽车的限制使用到禁止使用是对城市生态系统的最有利帮助。
This paper analyzes the status and restriction factors in urban sewage treatment at present in China, puts forward plan principles and basic countermeasures to control water pollution.
文章分析了目前我国城市污水处理的现状和制约因素，提出了控制水污染的规划原则和基本对策。
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