单词 | hafnium |
释义 | hafnium (once / 562825 pages) n WORD FAMILY hafnium USAGE EXAMPLESRhenium, zirconium, thallium, hafnium and lutetium are hardly household names. BBC(Sep 27, 2016) As an example, the New Scientists once ran a piece about how we were imminently going to run out of terbium and hafnium. Forbes(Dec 12, 2014) It consists of four layers of silicon dioxide interspersed with three of hafnium dioxide. Economist(Nov 27, 2014) n a grey tetravalent metallic element that resembles zirconium chemically and is found in zirconium minerals; used in filaments for its ready emission of electrons Syn|Hyper Hf, atomic number 72 metal, metallic element any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc. |
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