| 单词 | piston ring |
| 释义 | piston ring From Longman Dictionary of Contemporary EnglishMotor vehiclespiston ringˈpiston ring noun [countable]TTCa circular metal spring used to stop gas or liquid escaping from between a piston and the tube that it moves inExamples from the Corpuspiston ring• Pardue's aircraft had metal on the oil filter screens as well as part of a piston ring. |
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