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| English | Czech |
| fast reactor Nuclear reactor which produces more fissile material than it consumes, using fast-moving neutrons and making plutonium-239 from uranium-238, thereby increasing the reactor's efficiency | reaktor rychlý |
| fast-start financing | financování rychlého startu |
| fast-start funding | financování rychlého startu |
| fast traffic No definition needed | doprava rychlá |