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krypton

noun
🔊/ˈkrɪptɒn/
🔊/ˈkrɪptɑːn/
[uncountable]
(symbol Kr)
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  1. a chemical element. Krypton is a gas that does not react with anything, used in fluorescent lights and lasers.氪；氪气
    Word Originlate 19th cent.: from Greek krupton, neuter of kruptos ‘hidden’.