Yahoo香港字典 搜尋


  1. noble gas

    • IPA[ˌnəʊbl ˈɡas]


    • n.
      any of the gaseous elements helium, neon, argon, krypton, xenon, and radon, occupying Group 0 (18) of the periodic table. They were long believed to be totally unreactive but compounds of xenon, krypton, and radon are now known.
    • noun: noble gas, plural noun: noble gases