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.
近期公布的旅途中照片包括克林頓與工作人員一同步行、與地方官員握手時的笑容。
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