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acetylene

noun
/əˈsetəliːn/
/əˈsetəliːn/
(also ethyne)
[uncountable]
(symbol C2H2)
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  1. a gas that burns with a very hot bright flame, used for cutting or joining metal乙炔;电石气
    Word Originmid 19th cent.: from acetic acid + -yl + -ene.

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