petroleum nitrogen bases

例句：

1. 1.The oil field is located in the southwest of China.
   这个油田位于中国西南部。
2. 2. Petroleum is a non-renewable resource that needs to be extracted from the earth.
   石油是一种非可再生资源，需要从地球中提取。
3. 3. The oil industry has been greatly impacted by the recent global economic crisis.
   最近全球经济危机对石油行业产生了重大影响。
4. 1. Nitrogen is an essential element for plants and animals.
   氮是植物和动物必需的元素。
5. 2. Nitrogen fertilizers are commonly used to increase crop yields.
   氮肥常用于提高农作物产量。
6. 3.The atmosphere contains a small amount of nitrogen gas.
   大气中含有少量的氮气。