rough part

例句：

1. 1. The car's engine is a bit rough whenit starts up.
   汽车启动时发动机有点粗糙。
2. 2. The paint on the wall has arough texture.
   墙上的油漆质感粗糙。
3. 3. Theengineer used a rough part to fix themachine.
   工程师用一个粗糙的部分来修理机器。