For example,oil exports have been taxed by Organization of Petroleum Exporting Countries (OPEC) in order to raise revenue by controlling the supply and increasing the price of oil in the world market.

• 例如，石油输出国组织(欧佩克)对石油出口征收关税，其目的是通过控制石油的供应量、提高世界市场上的石油价格来增加收入。