double layer filter

例句：

1. 1.The double layer filter is designed to remove impurities from the water.
   双层过滤器设计用来从水中去除杂质。
2. 2. The double layer filter is essential for maintaining clean drinking water.
   双层过滤器对于保持清洁饮用水至关重要。
3. 3. The double layer filter is widely used in industrial processes to improve product quality.
   双层过滤器在工业过程中被广泛使用，以提高产品质量。