switch lock

例句：

1. 1. The old man used to keep a switch lock on the door.
   老人们过去常常把门锁上。
2. 2.The switch lock was easy to operate and had a secure mechanism.
   这个开关锁操作简单，而且机制安全。
3. 3. The switch lock was designed to prevent unauthorized access to the building.
   这个开关锁被设计用来防止未经授权进入建筑物。