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| red-flagging system | |||
| alert system | |||
| warning system Any series of procedures and devices designed to detect sudden or potential threats to persons, property or the environment, often utilizing radar technology | |||
| warning system; early-warning system | |||
| alarm system | |||
| alerting service; current-awareness-service | |||
| système d'alerte: 119 phrases in 28 subjects |