| 摘要 |
A bi-directional lock is used on a door of a house; which is comprised of inner and outer locking elements respectively fitted to inner and outer sides of the door so that people inside the house also have to use the key to unlock the door after the door has been locked; the lock is secured to the door in such a manner that none of the screws show that are used to fasten the lock to the door, preventing thieves from easily damaging, dismantling or removing the lock from the door to open the door.
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