hopper filter

例句：

1. 1. The oil pump filter is an essential part of the oil extraction process.
   油泵过滤器是石油提取过程中必不可少的一部分。
2. 2.The oil filter helps to remove impurities from the oil before it reaches the engine.
   油过滤器帮助从油中去除杂质，以免影响发动机。
3. 3. The oil purifier effectively removes harmful chemicals and pollutants from the oil.
   油净化器有效地从油中去除有害化学物质和污染物。