内置减压阀，避免因外来强压或强风形态下闭门而成造地弹簧保护或漏油。
Built-in pressure relief valve to protect the unit against any abuse from strong pressure or strong wind when closing the door.
内置减压阀，避免因外来强压或强风形态下闭门而成造地弹簧保护或漏油。
Built-in pressure relief valve to protect the unit against any abuse from strong pressure or strong wind when closing the door.
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