单词	the rudiments
释义	the rudiments 🌏的初衷
随便看	piston-ring flutter piston ring free gap piston ring gap piston ring gap clearance Piston ring gap clearance-oil control piston ring gap elearance piston ring gap in bore piston ring grinder piston ring grinding machine piston ring groove piston-ring groove piston ring groove cleaner piston ring grooves piston ring guard Piston Ring Identification piston ring joint piston ring joint clearance piston ring land piston-ring land piston ring lands piston ring-liner piston ring lock piston ring machine piston ring material piston ring packing