Experts predict that the highly polluting, grossly inefficient internal combustion engine will be superseded by a more environmentally friendly energy converter within 50 years.
专家预测，高污染、低效率的内燃机，在五十年内会被比较环保的能源转换器取代。
The results show that all the three types of catalytic converters can make the HCNG engine meet enhanced environmentally friendly vehicle (EEV) emission standard.
试验结果表明：三种催化器都能使天然气掺氢发动机排放达到环境友好型汽车标准。
The solar energy Stirling engine device utilizes renewable solar energy as the energy source of the engine, does not have waste gas emission and is environmentally friendly;
本发明的太阳能斯特林发 动机装置利用可再生能源太阳能作为发动机的能量来源、没有废气排放、 绿色环保；
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