folded filter

例句：

1. 1. The new folding filter is more efficient than the old one.
   这款新的折叠过滤器比旧的更高效。
2. 2. We need to use a folded filter to prevent contamination during the experiment.
   在实验过程中，我们需要使用折叠过滤器以防止污染。
3. 3. The folded filter is easy to clean and maintain, making it a popular choice for many users.
   折叠过滤器易于清洁和维护，这使得它成为许多用户的首选。