| 单词 | Hf |
| 释义 | Hf (once / 5909656 pages) n WORD FAMILY Hf 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 atomic number 72, hafnium 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. HF (once / 48243 pages) n WORD FAMILY HF USAGE EXAMPLESHF 2347 seeks to bridge the gap and that alone makes it worthy of support. Washington Times(Feb 29, 2016) Especially as some HF residents specialise in social engineering attacks that help them take control of other people's social media accounts. BBC(Feb 16, 2016) "That amount of HF — or even a portion of the HF — had the potential to vaporize and cause some injury." US News(Jan 13, 2016) n 3 to 30 megahertz Syn|Hyper high frequency radio frequency an electromagnetic wave frequency between audio and infrared |
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