他走到门边，把门打开一条缝，听了起来。
其它实时系统则利用一些算法来检测可疑的行为，比如一群人在一条被封住入口的门边徘徊，抑或定位那些看起来被人落下无人看管的行李物品。
Other real-time systems use algorithms to detect suspicious behaviour, such as a group loitering near a door where entry is barred, or to spot items of luggage that seem to have been left unattended.
一条三只腿的白狗叫着从大门边走过。
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