那些“中式梦核”的视频里，画面都是空的——教室、走廊、房间都空无一人。但真正的千禧年并非如此。那是一个热闹、温情的时代，每一个角落都盛满了声音与人情。
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Some smoke alarms have been designed to be ultra-sensitive. Aspirating devices, for example, constantly suck in air in order to detect even small quantities of smoke in a room. They are often used in commercial settings, including server rooms packed with expensive computer tech.