No need for any power suppliers, economic and environmentally friendly, lengthen the lifespan of storage battery. 。
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This reusable variety is designed to last anywhere from 10 to 15 years making it both economic and environmentally friendly.
这可重复使用的品种设计寿命大致在10至15年使经济和环保。
The effective operation of rural energy project shows that it does achieve the aim of economic and environmentally friendly energy utilization.
实践证明，这些能源项目的有效利用确实能够达到节能环保的目的。
What, then, is the most abundant feedstock for making ethanol which does not wreak havoc on food supplies, is environmentally friendly, economic and has all the enabling technologies in place?
那么，能够大量用于生产乙醇又不影响食物供应、环保、经济并且有所有可行技术的原料是什么呢？
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