根据建筑空调用能的特点，结合现代空调热泵技术分析城市中未利用的自然能源、废热排热等低品位能源的应用问题。
The Paper Discussed the applying Renewable Energy and Unutilized Energy occurred in City for HVAC System of Buildings by Heat pump technology.
我也呼吁国会允许开采丰富未利用的石油和天然气资源，扩大国内炼油能力，国力开发可替代能源。
I've called on Congress to permit us to tap vast, unused sources of oil and gas, expand domestic refining capacity, and encourage the development of alternative energy sources.
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