- keystone ring
- 梯形: ladder-shaped trapezoid; tra ...
- 环: ring; hoop
- 半梯形环: half keystone ring
- 梯形环和楔形环: internal combustion engines-piston rings-keystone rings and half keystone rings
- 形环: clevis eye u; o-ring o; oringo; stapling collar u; v-ring
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