OPEC:
OPEC (/ˈoʊpɛk/ pek) (Organization of the Petroleum Exporting Countries) is an international organization and economic cartel whose mission is to coordinate the policies of the oil-producing countries.
en.wikipedia.org
石油输出国组织:
石油输出国组织（英文：Organization of the Petroleum Exporting Countries，縮寫：-{OPEC}-；oʊ.pɛk；简称欧佩克、油盟或-{A|zh-tw:油組;zh-hk:油組;zh-cn:油组;zh-sg:油组;}-）是一個国际组织。
zh.wikipedia.org
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OPEC石油输出国组织