In practice, you should place the certifier under lock and key and may even put a guard (an actual person!) in charge of handing out the key via a very controlled mechanism.
实际上，您应该把证明锁起来再放上警卫(真正的人！)，通过严格控制的机制传递钥匙。
Absrtact: Multi - door lock machine online structure is a new fashioned distributed entrance guard control system.
摘要：多门锁位机联网结构是一种新型的集散式门禁控制体系。
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