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The air passages constrict when allergens (flower pollen, for instance) or other irritants are inhaled.
CNN: Making Child's Play Fun
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This reduces the sensitivity of the air passages to foreign particles, allowing young sufferers to get more out of life.
CNN: Making Child's Play Fun
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However, a cough can outlast all those other symptoms, perhaps because the air passages in your lungs remain sensitive and inflamed.
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Each room was equipped with air passages and smoke chimneys.
BBC: An ancient Ottoman capital surfaces
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But with more than 120 scheduled air passages each day between Scotland and London airports, you start to make an environmental case as well as one of convenience.
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The growing field is credited with recently saving a baby's life by allowing the speedy manufacturing of medical devices to keep his air passages open, and NASA is exploring ways of using 3-D printing to provide food to astronauts.
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Standing in the Grand Hammam excavation area, I could see the ruins of ancient chamber areas and air circulation passages that were slowly being restored.
BBC: An ancient Ottoman capital surfaces
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Later, the a tube can be passed down the throat or nasal passages so that air can be mechanically forced in by a bag or a ventilator.
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Within the passages, his Shamanistic figures stalk burning landscapes, levitate in air or float in water.
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Though it was intended as a temporary shelter, its amenities were impressive: some 600 above-ground doors from which someone can enter the underground city from, 15, 000 ventilation ducts to provide fresh air, as well as multiple wineries, cellars and a complex network of passages, tunnels, and corridors.
BBC: Six lesser-known wonders of the ancient world
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The caving crew descends through tight passages hundreds of feet beneath the Earth's surface, guided by the gust of air that marks the cave's primary passage.
FORBES: Magazine Article