chain closure

例句：

1. 1. The door is securely locked with a chain closure.
   这扇门用链条锁得紧紧的。
2. 2. This chain closure makes it easy to open and close the drawer.
   这个链条闭合使得打开和关闭抽屉变得很容易。
3. 3. The security system uses a chain closure for added security.
   这个安全系统使用链条闭合来增加安全性。