OPEC countries supply about 40% of world production.

欧佩克成员国的石油产量目前占世界总产量的40%。

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There currently are eleven member countries in OPEC.

目前石油输出国组织共有十一个成员国。

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There currently are eleven member countries in OPEC.

目前石油输出国组织共有十一个成员国。

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