Poverty of mountainous areas of southern Ningxia was the typical model of environmentalrestriction.
宁夏南部山区的贫困系典型的环境制约型地区的贫困。
2
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。
3
These factors not only provide the bases and the safeguards, but also become the restriction condition for constituting the environmental standard.