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单词 helium
释义 helium
helium /ˈhiː.li.əm/ noun [U] (SYMBOL He)
F0 a chemical element that is a gas lighter than air, that will not burn and is used in balloons, airships, and some types of lightsThesaurus+: ↑Chemical elements
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更新时间:2025/3/19 22:12:49