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柯林斯高阶英汉双解学习词典释义
  • N-UNCOUNT
    Helium is a very light gas that is colourless and has no smell.
英汉词典释义
英英词典释义
  • Noun
    1. a very light colorless element that is one of the six inert gasses; the most difficult gas to liquefy; occurs in economically extractable amounts in certain natural gases (as those found in Texas and Kansas)
行业词典
  • 医学: 氦:一种无色、无臭及无味的惰性气体,不自燃也不助燃。最初自太阳中测出,后从天然气体中获得。化学符号He,原子序2,原子量4.003。医学上〔USP〕用作气体的稀释物,例如在治疗某些呼吸障碍时用以稀释氧。也用作全身麻醉药的稀释剂;
    机械: 氦氖激光器,helium-neon laser, He-Ne laser 以氖为工作物质、氦为辅助气体的激光器;
    物理学: 氦镉激光器,helium-cadmium laser;