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| English | Lithuanian |
| 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 | spartusis reaktorius |
| fast-start financing | "skubios pradžios" finansavimas |
| fast-start funding | "skubios pradžios" finansavimas |
| fast traffic No definition needed | greitasis eismas |