fuel element cleaning

例句：

1. 1. The engine needsto be cleaned regularly to ensure optimal performance.
   发动机需要定期清洁以确保最佳性能。
2. 2. During maintenance, the fuel elements are cleaned and inspected for any damage.
   维护期间，燃料元件会被清洁并检查是否有损坏。
3. 3. The cleaningprocess involves removing contaminants fromthe fuel elements and replacing them with freshones.
   清洁过程包括从燃料元件中去除污染物并用新鲜材料替换它们。