hard carbon brush

例句：

1. 1.The hard carbon brush is used to clean the engine.
   硬碳刷用于清洁发动机。
2. 2. The hard carbon brush is a crucial component in the engine.
   硬碳刷是发动机中一个关键的组成部分。
3. 3. The hard carbon brush is made of high-quality carbon fibers.
   硬碳刷是由高质量的碳纤维制成的。