keystone ring meaning in English

梯形环

Internal combustion engines - piston rings - keystone rings
内燃机.活塞环.梯形环
Internal combustion engines - piston rings - half keystone rings
内燃机活塞环.单面梯形活塞气环
Internal combustion engines - piston rings - half keystone rings made of steel
内燃机.活塞环.钢制半梯形环
Internal combustion engines - piston rings - half keystone rings made of cast iron
内燃机.活塞环.铸铁制半梯形环
Internal combustion engines - small diameter piston rings - part 9 : keystone rings
内燃机.小直径活塞环.第9部分:楔形环

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