[机] 凸形滚轮组 convex roller: (凸)球凸面滚子; 球面滚子convex asymmetrical roller: 非对称球面滚子convex roller bearing: (凸)球面滚子轴承convex symmetrical roller: 对称球面滚子haulage rope roller battery: 牵引索滚子组下载手机词典可随时随地查词查翻译