Oil pools are valuable underground accumulations of oil, and oil fields are regions underlain by one or more oil pools.

油藏是珍贵的地下石油堆积物，而油田是由一个或多个油藏所组成的地下区域。

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What is more valuable, an art poster that Wal-mart ordered fifty thousand copies of, or a hand-signed, one of a kind oil canvas?

想想哪个更值钱：是一份沃尔玛里卖的50000份艺术海报中的一份呢，还是一位油画家亲手签名的油画？

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With so much of the press focused on wars over oil, the world is often unaware of the slowly depleting water sources, which are indeed exponentially more valuable than oil.

由于过多的注意力放在了石油战争上，热门经常忽视了慢慢流逝的水资源，尽管水比油要重要了千万倍。

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In practice, however, the ease of using oil for making gasoline means that oil is more valuable.

FORBES: Oil And Natural Gas Prices Get Divorced

Having nothing but brains and patents may be an infinitely more valuable model than owning oil fields and pipelines.

FORBES: Google's Gargantuan Valuation

That would apply not only to a huge number of geothermal sites, but also to many oil wells, which often bring up warm water from great depths along with their more valuable output.

ECONOMIST: Geologists are getting more juice out of the ground