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noble gas

noun

🔊/ˌnəʊbl ˈɡæs/

🔊/ˌnəʊbl ˈɡæs/

(also inert gas, rare gas)

(chemistry化学)

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any of a group of gases that do not react with other chemicals. Argon, helium, krypton and neon are noble gases.惰性气体；稀有气体