// 5. 返回当日跨度（而非整个结果数组）
Future smoke alarms might use very different tech. Researchers have developed an AI-based system that uses machine learning to detect fire in video feeds. The tool can spot fire and smoke in footage from "any camera", says Prabodh Panindre at New York University – including CCTV, doorbell cameras and phone cameras.
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Sainsbury's to cut 3,000 jobs and shut cafés
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Tesco cut jobs in bakeries and phone shops last year