一队武装警卫抵达并守卫在牢房区大门处。
A group of armed guards have arrived and are waiting outside the gate.
有人得到机会在监狱大门处将他们拍摄下来。
Someone had got a chance to take their pictures at a prison-compound gate.
可以这样看待两种验证，小区大门处的一名保安和您自己的家庭安全系统。
Think of it as having a security guard at a gated community along with your own home security system.
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