stub key washer

例句：

1. 1.The stub key washer is a small tool used to remove the screws from a broken computer keyboard.
   断键垫圈是一种小工具，用于从损坏的计算机键盘上拆下螺丝。
2. 2.After fixing the keyboard, the technician replaced the stub key washer with a new one.
   维修完键盘后，技术人员用一个新的替换了断键垫圈。
3. 3. The old stub key washer had worn out and needed to be replaced.
   旧的断键垫圈已经磨损需要更换。