The vault itself was protected by a dual lock system: a combination and a key lock, and two feet of reinforced steel.
保险库采用密码加钥匙的双重保护系统，并使用厚达两英尺的强化钢板。
Keys are able to play the lock, is due to the most understand key lock heart!
钥匙之所以能够打开锁，是由于钥匙最懂锁的心！
Teach the child how to use the key, lock all doors and Windows from the inside, and safely store the key.
教孩子怎样用钥匙，怎样从屋内锁好门窗及怎样把钥匙放好。
Teach the child how to use the key, lock all doors and Windows from the inside, and safely store the key.
教孩子怎样用钥匙，怎样从屋内锁好门窗及怎样把钥匙放好。
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