No，itcannotbeopenedfromtheoutside。防盗门外面是无法开启的。Whenthedoorislocked，asecuritylockwillbeinstalledintheinnersideofthedoor。Peoplecanonlyopenitwithakeyoracombinationlockcardfromtheinside。Thepurposeofthisistopreventothersfromenteringthehousewithoutpermission。把门锁住的时候，内侧会安装一把安全锁，只有用钥匙或组合锁卡才能从里面开启，这样就可以防止有人未经允许进入你的家。Apartfromanti-theftdoors，therearemanyotherelectronicandmechanicallocksonthemarket，suchasmagneticlocks，biometriclocks，etc。，whichcanbetterprotectourpersonalsafetyandproperty。除了防盗门外，市场上还有许多其他电子机械锁，比如磁力锁、生物识别锁等，能更好的保护我们的人身及财产安全。