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1. Oxford Dictionary

   helium

   • IPA[ˈhiːlɪəm]

   英式

   • n.
     the chemical element of atomic number 2, an inert gas which is the lightest member of the noble gas series.

   • noun: helium

2. • 更多解釋

   helium

   • IPA[ˈhēlēəm]

   美式

   • n.
     the chemical element of atomic number 2, an inert gas which is the lightest member of the noble ...

   Oxford American Dictionary