Take the door knob off a door and put it back on backwards, then lock it and leave the door open.

取下门把手，装到门的另一侧，并且让门开着。

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This paper design a door-lock control equipment which use fingerprint control on-off door. Open the door only press finger.

本文设计了一种利用人的指纹来控制打开门锁的门禁机，只要手指一按，即可开门，免去了传统的机械钥匙的烦恼。

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