Offshore drilling 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。

youdao

As oil becomes increasingly difficult to find, the search for it is extended into more hostile environments.

石油变得越来越难找，对它的搜寻也随之延伸到了更恶劣的环境。

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The geological prospecting team ranged over the desert in search of valuable deposits of oil.

地质勘探队走遍了这片沙漠，寻找有开采价值的油层。

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The oil giant has also purchased Internet search terms on Google and Yahoo to direct inquiries to its website.

VOA: standard.2010.06.10

Three times a day,crews take off from the Coast Guard station in Clearwater to search for oil.

VOA: standard.2010.07.05

Oil Search declined 2.2% in Sydney, while Woodside Petroleum sank 5.8% after delivering disappointing production guidance for fiscal 2012.

WSJ: Asia Slips on Europe Worries

The spiralling price of crude has caused oil companies to search even harder for it.

ECONOMIST: An unconventional bonanza

Over the years, wells have plunged deeper into the Gulf in search of oil.

CNN: John D. Sutter