duplex lock

例句：

1. 1. The duplex lock on the door is very secure.
   门上的复式锁非常安全。
2. 2. They installed a new duplex lock for their home security.
   他们为家庭安全安装了一个新的复式锁。
3. 3. The duplex lock was easy to install and worked perfectly.
   这个复式锁安装简单，工作完美。