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单词	hafnium
释义	hafnium /ˈhafnɪəm / noun [mass noun] The chemical element of atomic number 72, a hard silver-grey metal of the transition series, resembling and often occurring with zirconium. (Symbol: Hf) Titanium is found in column four along with chemically similar zirconium, hafnium, and thorium.... For most of history, hafnium and zirconium were not clearly distinguished from each other. Samarium is a rare earth element, one of the elements that occupy the space in Row 6 of the periodic table between lanthanum and hafnium. Origin 1920s: modern Latin, from Hafnia, Latinized form of Danish Havn, former name of Copenhagen.
随便看	red reflex red republic red republican red republicanism re-dress redress redressable redressal redresser redressive redressment redress the balance red revolution red rhebok red ribbon Red Riding Hood redrill red-rimmed red-ripe red rise redrive Red River Red River cart Red River fever Red River frame

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