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单词 helium
释义

helium

1 ENTRIES FOUND:
helium /ˈhiːlijəm/ noun
helium
/ˈhiːlijəm/
noun
Learner's definition of HELIUM
[noncount]
: a chemical element that is a colorless gas, that is lighter than air, and that is often used to fill balloons氦;氦气
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