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Listen to the headAcrylic plastic
Earring: Copper
Earplugs: PVC
Spring Sheet: Manganese Steel
The Book of Master Guan" 或 "The Analects of Master GuanPVC"管"在中文中通常指的是一种用于控制或引导流体、气体、粉末等物质的设备或工具。例如，水管、气管、烟管、风管等。在中文里，"管"也可以指负责管理或监督某项事务的人，例如"管理员"、"主管"等。
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