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Air naturally stratifies, i.e. warmer air rises to the ceiling while cooler air sinks, meaning that colder air settles near the floor where people spend most of their time. A ceiling fan, with its direction of rotation set so that the warmer air on the ceiling is pushed down along the walls and into the room, heating the cooler air.
CASC Rainbow (Chinese: 彩虹; pinyin: cǎihóng, abbreviation CH) is a series of unmanned aerial vehicles (UAVs) marketed by China Aerospace Science and Technology Corporation (CASC).
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