untreated oil

例句：

1. 1.The engine needs to be lubricated with untreated oil before it can be used again.
   发动机在使用前需要用未经处理的油进行润滑。
2. 2. The company uses untreated oil in its production processes to reduce costs.
   该公司在其生产过程中使用未经处理的油以降低成本。
3. 3. The untreated oil was tested for contaminants and found to be safe for human consumption.
   未经处理的油被测试以检测污染物，并被发现对人类是安全的。