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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.

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。

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Tooth problems left unattended can become worse over time and may lead to more severe problems.

长期放任牙齿问题不管会令它越来越严重，并可能导致诸多严重问题。

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"At no point of time the cockpit was left unattended by the cockpit crew, " the airline said in a statement.

CNN: Pilot, crew suspended after cockpit incident

But fishermen also follow the fish, and often snag the dolphins unintentionally in the large-mesh nets they leave unattended for days at a time.

ECONOMIST: The Mekong river