lock sill

例句：

1. 1.The door was locked from the inside.
   门从里面锁上了。
2. 2. They secured the perimeter with barbed wire.
   他们用带刺的铁丝加固了边界。
3. 3. The thief tried to lock the safe but failed.
   小偷试图锁上保险箱但失败了。