condition of self locking

例句：

1. 1. The door hasa self locking feature that preventsunauthorized access.
   这扇门有一个自我锁定的功能，防止未经授权的进入。
2. 2. The car's self lockingsystem ensures that the doors remain closed untilthe key is inserted.
   汽车的自锁系统确保车门在钥匙插入前保持关闭。
3. 3. The self locking mechanism of thesafe prevents unauthorized access tothe contents.
   保险箱的自锁机制防止未经授权访问内容。