For Opec对欧佩克而言
gas OPEC天然气欧佩克
OPEC OPEC石油输出国组织;欧佩克
OPEC output欧佩克产量
opec listner欧佩克听众
OPEC behaviors欧佩克行为
OPEC Fund欧佩克基金;国际开发基金
opec countries石油出口国
arab opec阿拉伯石油输出国组织
N-PROPER（专有名词） OPEC is an organization of countries that produce oil. It tries to develop a common policy and system of prices. OPEC is an abbreviation for "Organization of Petroleum-Exporting Countries." 石油输出国组织
Each member of OPEC would seek to maximize its own production.
石油输出国组织的每个成员国都会设法将本国产量增到最大。