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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特朗普的其他言論也加劇了外界的擔憂，即先前被豁免的商品可能會被加徵新關稅。
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