Fuel Cell vehicle (FCV) is the vehicle that we are looking for to use clean fuel (hydrogen energy) and realize zero emission.

燃料电池汽车正是利用清洁的氢能源、并可实现零排放的汽车。

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To keep the inside working parts of your engine clean, use engine oil and fuel that have tested engine cleaning properties.

为保持引擎内部工作部件的清洁，使用经检测具有清洁引擎性能的机油和燃料。

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An artificial leaf would use a reaction that forms part of the natural process of photosynthesis to turn sunlight and water into a clean fuel source.

“人造叶”将利用构成光合作用中部分自然过程的反应作用，将阳光和水变成一种清洁燃料的来源。

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Virgin Atlantic President Richard Branson said the test flight would help the airline to use clean fuel sooner than expected.

CNN: Biofuel-powered jet makes test flight

We're expanding the use of hybrid and clean diesel vehicles and biodiesel fuel.

NPR: President Bush's Remarks on the World Agenda

The RPS would require utilities to use a minimum percentage of clean power--such as wind, hydropower or solar energy--in their overall fuel mix, or it would require electric companies to buy renewable credits from each other.

FORBES: Magazine Article