交输， 燃油支管之间的交连设备。 可使燃油从飞机一侧流向邻近的发动机或在机身另一侧的发动机。

CROSSFEED, An interconnection between fuel manifolds for fuel flow from one side of the airplane to an adjacent engine or one on the other side.

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APU通常从左发动机供油管路获得燃油，如果交输活门打开，右发动机供油管路也可以供应apu燃油。

The APU usually takes its fuel supply from the LH engine-feed line, but when the cross-feed valve is open, the RH engine-feed line can also supply the APU with fuel.

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这种燃油税制将每辆汽车要交的养路费转换成税费，在道路等公共设施日益成为一种稀缺资源的大背景下，更多地体现了“多用多缴，少用少缴”的公平原则。

This convertion reflects the the principle of fairness just as "more pay more, or pay less" when roads and other public facilities are increasingly becoming scarce resources.

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