backing ring是什么意思？

• pear
• crayon
• neck
• sweater
• PEGGING
• peeping
• permitted
• 流浪者英文
• bothering
• fake
• PAXLOVID怎么读
• 解决方案英文
• various
• disappointed
• explore
• giraffe
• conflict
• searches
• maths
• toxicity
• theatre
• saturday
• BARRIE
• 纪念品英语
• approaches
• passage
• dragon
• begins
• intermission
• repeat

• reveal
• tomato
• text
• scared
• 领域英语
• panicked
• 造型的英文
• 方案英语
• rice
• silver
• 来源英语
• organizations
• banger
• volume
• 局外人英文
• emergency
• narrow
• brat
• vehicle
• juice
• client
• fiercely
• giraffe
• 参与者英文
• lesson
• tourist
• passage
• bombarded
• mind
• profile

• index gauge
• malonic
• vortexing
• sequence of ideas
• atwain
• lecture room
• half swing
• Chief Jung
• viridis
• overprint
• geun
• or heredity
• to heavens
• CGS Electromagnetism
• at all places
• sink into
• printshop
• Dermochelys
• harness wire
• big and fleshy
• heteroid