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There are two main types of smoke alarm tech, says Raman Chagger, principal consultant at BRE, the Building Research Establishment. Ionisation-based systems use a tiny amount of radioactive material to charge, or ionise, particles in the air which flow between two small plates. Should smoke interrupt that flow of charged particles, the alarm goes off.
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智能眼镜 N50：代号 N50，对标 Meta Ray-Ban 但要更高端。无显示屏，靠扬声器、麦克风和双摄像头实现功能——一颗拍照录像，一颗专门用于计算机视觉。计划 2027 年发售；
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