It takes more upkeep, burns more fuel and is slow 6 the starting line because it depends on learning—a (an) 7 process—instead of instinct.

它需要更多的保养，消耗更多的燃料，起步慢，这是因为聪明依赖学习——一个渐进的过程——而不是本能。

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Even though you save on kerosene, it takes more than three years after purchase for the total cost of running a compact fluorescent lamp to drop below that of a kerosene lamp and fuel.

如果不用煤油灯，节省下来的灯油钱，要三年才抵得上购买一个紧凑型灯的花费。

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Some have even calculated a ratio less than one, meaning it takes more energy to produce ethanol from corn than the energy content of the fuel.

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Even in such conditions, it takes less than 30 seconds to boost itself into operation, compared with five minutes or more for existing fuel cells.

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It offers remarkable fuel efficiency--more on that in a minute--but the tradeoff is that it takes 27 minutes to get from sea level to 41, 000 feet, which is both the Mustang's maximum operating altitude and its most fuel-efficient.

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