crude oil analysis

例句：

1. 1. Crude oil analysis is essential for understanding the origins of petroleum.
   原油分析对于理解石油的来源至关重要。
2. 2.The company conducted a crude oil analysis to identify potential contaminants in the sample.
   该公司进行了一次原油分析，以识别样本中的潜在污染物。
3. 3. The crude oil analysis revealed that the sample contained trace amounts of methane.
   原油分析显示样本中含有微量的甲烷。