When homeowners replace a working oil system, it can take five or ten years, if not longer, to get their money back in fuel savings.

当住户们替换掉一个燃油设备后，他们如果不用等更久的话，那么在五年或者七年时间里就能拿回因节约燃料而得到的补偿的钱。

youdao

There are many piping systems in the engine room, such as fuel oil system, cooling system, lubricating system, fire-fighting system. How do you identify them?

机舱中有许多管系，像燃油系统，冷却系统，滑油系统，消防系统，怎样识别它们？

youdao

This kind of boiler is very safe. If it were to go wrong, the controlling system would cut off the fuel oil supply automatically.

这种锅炉很安全。万一锅炉发生故障，控制系统会自动切断燃油的供给。

youdao

They'll be jobs building the wind turbines and solar panels and fuel-efficient cars that will lower our dependence on foreign oil, and modernizing our costly health care system that will save us billions of dollars and countless lives.

WHITEHOUSE: Presidential Press Conference