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Domed city
A domed city is a kind of theoretical or fictional structure that encloses a large urban area under a single roof. In most descriptions, the dome is airtight and pressurized, creating a habitat that can be controlled for air temperature, composition and quality, typically due to an external atmosphere (or lack thereof) that is inimical to habitation for one or more reasons. Domed cities have been a fixture of science fiction and futurology since the early 20th century, and may be situated on Earth, a moon or other planet.
==Origin==
It is not clear exactly when the concept of a domed city first appeared. The phrase "domed city" had come into use by the 19th century in a different sense, meaning a skyline with dome-topped buildings. One catalog of early science fiction mentions the 1881 socialist and white supremacist fantasy ''Three Hundred Years Hence'' by British author William Delisle Hay. Hay's book describes a future civilization where most of humanity lives in glass-domed cities beneath the sea, allowing the surface of the earth to be used primarily for agriculture. Several examples from the early 20th century are also listed.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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