wash oil still

例句：

1. 1.The factory uses a wash oil still toclean its machinery.
   这家工厂使用洗油机来清洗其机械。
2. 2. The engineerdesigned the new wash oilstill to improve efficiency.
   工程师设计了新的洗油机以提高效率。
3. 3. Thewash oil still is essential for maintaining thequality of the oil.
   洗油机对于保持油的质量至关重要。