You change the oil in your car and put gas in the tank because you don't take your car's function for granted. It needs fuel and care to get going.

你给你的车换油加气是因为你重视它，车子需要油和维护才能走。

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As a fuel, ethanol has a lower energy density and therefore needs more of it to do the same job.

作为一种燃料，乙醇的能量密度更低，所以需要消耗更多的量来完成同样的工作。

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Just like your car, your brain needs fuel and regular care to perform like you need it to.

你的大脑就像你的车一样，需要汽油和定期护理才能像你所需要的那样运作。

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As a fuel cell, it also needs fuel to run, in this case natural gas or another source of methane (such as landfill gas or biogas from anaerobic digesters).

FORBES: The Economics of Bloom Energy's 'Breakthrough' Fuel Cell

The financial regulators in particular, now that Dodd-Frank has given them great power to ration credit and direct it toward the public sector, will be able to deprive the private sector of the fuel it needs to pick up speed and push up interest rates.

FORBES: ZIRP, Zombies And The Japanization Of The American Economy

Under the proposal, Iran would get the fuel it needs for its research reactor in Tehran, but this would not be sufficiently enriched to make a bomb.

BBC: Iran delays reply on nuclear plan