Both oil and gas are less dense than water, so they generally tend to rise upward through water-saturated rock and sediment.

石油和天然气的密度都比水小，所以二者通常会浮在被水浸泡的岩石和沉积物的表层。

youdao

When people began to realise that there was not enough oil on the earth, they asked car makers to produce more efficient and less polluting cars.

当人们开始意识到地球上没有足够的石油时，他们要求汽车制造商生产能效更高、污染更少的汽车。

youdao

Non conflagate and less insitation, it is an ideal substitute for gasoline and diesel oil using for cleaning.

它不挥发且低刺激，是汽油和柴油理想的清洁替代品。

youdao

"If coal and gas and oil had to pay the price for the damage that they did,we would use a whole lot less of them.

VOA: standard.2010.04.21

The economy as a whole runs more efficiently by using less oil and producing less pollution.

WHITEHOUSE: President Obama: A New Consensus on Auto Emissions

Not just oil and gas, but also wind and solar and biofuels. (Applause.) We've got to keep developing the technology that allows us to use less oil in our cars and trucks, less oil in our buildings and our factories.

WHITEHOUSE: President Obama Speaks on American Energy

As traditional oil fields yield less and less, major producers are looking for crude in less conventional places, from oil sands and shale plays to ultra deepwater.

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