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单词 inert gas
释义 inert gas
noun
1. : a gas (as nitrogen or carbon dioxide) that is normally chemically inactive especially in not burning or supporting combustion
2.
 a. : one of the group of gases comprising helium, neon, argon, krypton, xenon, and sometimes radon
 b. : a member of the helium group — called also noble gas, rare gas
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