Offshoredrilling platforms extend the search for oil to the ocean's continental shelves—those gently sloping submarine regions at the edges of the continents.
海底钻井平台将寻找石油的区域延伸到了海洋大陆架——大陆边缘那些平缓倾斜的海底区域。
2
More than one-quarter of the world's oil and almost one-fifth of the world's natural gas come from offshore, even though offshoredrilling is six to seven times more expensive than drilling on land.
全球超过四分之一的石油和近五分之一的天然气来自近海，尽管近海钻探的成本是陆地钻探的六到七倍。
3
The decision was an unfavorable one among both critics and proponents of offshoredrilling.