名词
中文翻译：未燃烧的燃料
同义词：
['unused fuel', 'unused oil', 'unrefined oil']
例句：
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1.The new engine uses unburnt fuel to improve efficiency.
新引擎使用未燃烧的燃料来提高效率。
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2. The old car's engine was running on unburnt fuel.
旧汽车的引擎是用未燃烧的燃料运行的。
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3. The researchers found that the unburnt fuel could be used as a source of energy.
研究人员发现未燃烧的燃料可以作为能源来源。