A door chain, security chain, or security door chain consists of a small chain attached to the door frame, which attaches to a track on the door for security purposes. It is a type of lock that is often used along with other types of locks to secure a door.
例句与用法
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For added protection , fit a high quality door guard or door chain and a wide angle viewer 若要加强保安，可安装优质防盗?或门扣，广角防盗眼也是不可缺少的。
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