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.
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This sounds reasonable until you see how easily it goes wrong:
蓋茨基金會的一位發言人在聲明中表示:「這是一場事先安排的員工大會,比爾每年會舉行兩次。」