They ran out of fuel.

他们的燃料用完了。

...industrial research into cleaner fuels.

对更清洁燃料的工业研究

The result will inevitably fuel speculation about the Prime Minister's future. [VERB noun]

这一结果将不可避免地加剧人们对首相未来的揣测。

The economic boom was fueled by easy credit. [be VERB-ed]

宽松的信贷政策刺激了经济繁荣。

His comments are bound to add fuel to the debate.

他的话必将为争论推波助澜。

The decision to raise tariffs on imports will only add fuel to the fire.

上调进口关税的决定只会火上浇油。