事例:为了保障小区居民的安全,最近,物业在小区门口安装了铁栅栏门,并设置了汽车通道。汽车通道有护栏阻挡,刷卡才能通过。而居民通过的铁栅栏门也安装了电子门锁,居民进入小区的时候,需要刷门卡才能打开铁栅栏门,而出去时,则按一下铁栅栏门旁边的开关,门锁就开了。这个铁栅栏门紧挨着小区的广场,老人们喜欢在广场上晒太阳,聊聊天儿,而孩子们则喜欢在广场上追逐打斗。虽然有爷爷奶奶等人看护着孩子,但门卫还是一再提醒跑到铁栅栏门旁的孩子远离这里,因为车来车往 Example: In order to protect the safety of residential residents, recently, the property in the cell door installed iron gate, and set the car channel. Car barriers have barrier, credit card to pass. The residents through the iron gate also installed electronic door locks, residents into the district, you need to brush the door card to open the iron fence door, and go out, then click the iron fence door next to the switch, the door opened. The iron fence door next to the square plaza, the elderly like to square in the sun, chatting, children like to chase fighting in the square. Although there are grandparents waiting for children, etc., but the guard repeatedly reminded run to the iron gate children away from here because the car to the car