Abrasion resistant radial wear ring is standard on Model 6123 and smaller. Hardened SS Wear Rings optional on all models.是什么意思_Abrasion resistant radial wear ring is standard on Model 6123 and smaller. Hardened SS Wear Rings optional on all models.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句