Roughly five and a half million foreign workers play an important role in the Saudi economy, for example, in the oil and service sectors.

大约由550万名外籍工作者在沙特经济中起了重要的作用，例如，在石油和服务部门中。

youdao

ScienceDaily (June 18, 2010) -the Gulf of Mexico: what role will the Mississippi River play in oil washing ashore and into delta wetlands?

科学日报(2010年6月17日)- - -墨西哥湾：密西西比河将在石油污染沿海以及三角洲湿地地区起到怎么的作用呢？

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Other possible reasons include problems with the oil pump, rod and main bearing clearances, camshaft end play, or CAM bearings and lifters.

其他可能的原因包括油泵问题，杆和柱轴承之间的空隙，凸轮轴停止工作或者凸轮的方位和升降等。

youdao

Statoil, like Cnooc, is majority government-owned (see Statoil: The Government Oil Play), but no politicians had made a peep about Norwegians invading the U.S. oilpatch.

FORBES: Watch Out America, China Is Coming For Your Oil And Gas!

Oil prices play a major role in global economic growth because oil is crucial to every part of the economy.

FORBES: Falling Oil Prices: Worrying Trend Or Saving Grace?

Did oil wealth play a part in today's takeover?

NPR: Army Seizes Control of Oil-Rich Mauritania