primary petroleum

• 初级石油

primary petroleum的用法和样例：

例句

1. Petroleum coke can be used as either a primary or a secondary fuel.
   石油焦炭既可用作初级燃料也可用作二级燃料。
2. The success of OPEC has inspired countries exporting primary products other than oil.
   石油输出国组织的胜利鼓舞了输出其它初级产品而不是输出石油的国家。