plain washer

• 普通垫圈,平垫圈

plain washer的用法和样例：

例句

1. The washer for preventing leakage is broken.
   那个防漏的垫圈坏了。
2. The spring washer in a missile's demarcating implement was ruptured in a assembly.
   摘要某型号导弹位标器用弹簧垫圈在现场装配时发生断裂。