"0"^^ . "111488160"^^ . "nuclear propulsion"@en-us . . "0"^^ . . . "110747136"@en-us . . "nuclear propulsion"^^ . . . "the use of a nuclear reactor either to produce electricity to power an engine (as in a nuclear submarine) or to directly heat a propellant (as in nuclear rockets)"@en-us . . . "11488160-n"^^ . .