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radioactivity (n.) , [pl. radioactivities]
radioactivity (n.) , [pl. radioactivities]
radioactivity (n.) , [pl. radioactivities]
radioactivity (n.) , [pl. radioactivities] , {phys.}
natural (adj.) , [ more natural ; most natural ]
natural (adj.) , [ more natural ; most natural ]
natural (adj.) , [ more natural ; most natural ]
natural (adj.) , [ more natural ; most natural ]
natural (adj.) , [ more natural ; most natural]
natural law {phys.}