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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.
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雖然，他讓人民沉浸在「美國去死」的修辭中，但他的外交政策經過精心設計，既不妥協也不與華盛頓直接對抗。
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