fouling section

例句：

1. 1. The car's engine has a fouling section that needs to be cleaned regularly.
   这辆车的引擎有一个需要定期清理的污损部分。
2. 2.The scientist found a fouling section in the sample that could affect its results.
   科学家在样本中发现了一个污损部分，可能会影响其结果。
3. 3. The engineer repaired the machine by removing the fouling section and replacing it with a new one.
   工程师通过移除污损部分并用一个新的替换它来修理了这台机器。