Nuclear energy may overtake oil as the main fuel.

核能可能会超过石油成为主要燃料。

《牛津词典》

Humanity's main fuel for eons was wood, which has a carbon-to-hydrogen ratio of 10 to 1 when burned; by comparison, that ratio is 2 to 1 for coal and 1 to 2 for oil.

千万年以来，人类的主要燃料是木头，燃烧木头的过程中，碳和氢的比率是10比1。相比较而言，煤在燃烧过程中这个比率是2比1，而石油的比率则是1比2。

youdao

If you dig deep enough, with luck, you will strike oil or gAS, which are used AS our main sources of fuel and energy.

如果你挖得够深，就可能挖到石油或者天然气。这些东西都是人类的主要燃料和能源。

youdao

Another negative was the impact of record crude oil prices that pushed fuel costs significantly higher and were a main factor behind an 8.2% gain in total costs.

BBC: NEWS | Business | BA profits up on ticket increases