五金配件材质精细耐用，操作顺畅舒适。
Hardware accessories, smooth operation fine durable material comfort.
开合效果和耐用性、自然、顺畅、无声是基本的要求。
Switching effect and durability, natural, smooth, silent are the basic requirements.
开合效果和耐用性、自然、顺畅、无声是基本的要求。
Switching effect and durability, natural, smooth, silent are the basic requirements.
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