When the cooling system failed at Japan's Fukushima Dai-Ichi reactor Number 2, the fuel rods boiled through the available water and were for a period of hours exposed to the air.

日本福岛二号核反应堆冷却系统破坏后，核燃料棒将可用的水煮沸，并露出水面数小时。

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The fuel system must vary the proportions of air and fuel to suit different operating conditions.

燃料系统必须改变空气和燃料的比例以适应不同的运行状态。

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We have seen how the mixture of air and fuel is delivered by the fuel system to the engine cylinder, where it is compressed, ignited, and burned.

我们已经了解油气混合燃料是如何通过燃料供给系统输送到发动机气缸，并在气缸中压缩、点火、燃烧的。

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Apparently there was an air bubble somewhere in their fuel system that was turning this rather simple routine into an all-day affair of filling up and emptying out jerry cans.

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