preliminary washing drum

例句：

1. 1.The preliminary washing drum was designed to remove dirt and debris from the fabric before it was washed.
   预洗滚筒的设计是为了在织物被清洗之前，去除其上的污垢和杂质。
2. 2. The company's new preliminary washing drum has significantly improved the efficiency of the cleaning process.
   该公司的新预洗滚筒大大提高了清洁过程的效率。
3. 3. In this workshop, we will learn how to use a preliminary washing drum to clean clothes effectively.
   在这个工作坊中，我们将学习如何使用预洗滚筒有效地清洗衣物。