petroleum crude oil

例句：

1. 1.The petroleum industry is a major contributor to the economy.
   石油工业是经济的主要贡献者。
2. 2. Crude oil prices fluctuate widely due to market demand.
   由于市场需求，原油价格波动很大。
3. 3.The extraction of petroleum from underground reservoirs is a complex process.
   从地下储层提取石油是一个复杂的过程。