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单词 helium
释义 helium/ˈhi:liəm/n. Chem. a colourless light inert gaseous element occurring in deposits of natural gas, used in airships and as a refrigerant (symbol He) 【化】(化学元素) [Greek hēlios ‘sun’ (having been first identified in the sun's atmosphere)]
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更新时间:2025/3/30 16:48:58