Warning: file_put_contents(): Only 0 of 7227 bytes written, possibly out of free disk space in /home/www/wwwroot/ndsq.cn/index.php on line 55 piston ring英英字典_piston ring剑桥英语解释_piston ring柯林斯英文解释_開心英語字典_柠咚词
1. N a split ring, usually made of cast iron, that fits into a groove on the rim of a piston to provide a spring-loaded seal against the cylinder wall 活塞環