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| Portal (doorway) ： ウィキペディア英語版 |
Portals in fiction
A portal in science fiction and fantasy is a technological or magical doorway that connects two distant locations separated by spacetime. It usually consists of two or more gateways, with an object entering one gateway leaving via the other instantaneously.
Places that a portal will link to include a different spot in the same universe (in which case it might be an alternative for teleportation); a parallel world (inter-dimensional portal); the past or the future (time portal); and other planes of existence, such as heaven, hell or other afterworlds. A parallel world, such as C. S. Lewis's Wood between the Worlds in his ''Chronicles of Narnia'', may exist solely to contain multiple portals, perhaps to every parallel world in existence.
Portals are similar to the cosmological concept of a wormhole, and some portals work using wormholes.
== Use ==
Portals are often used in science fiction to move protagonists into new territory. In video games the concept is often used to allow the player to cover territory that has already been explored very quickly. A related book plot that is commonly used is the struggle to get to the opposite end of a new gate for the first time, before it can be used.
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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