| 单词 | helium |
| 释义 | helium['hi:liəm]n. 氦【化】 氦【医】 氦(2号元素) helium he.li.um AHD: [h¶“l¶-…m] D.J. [6hi8li8*m]K.K. [6hili*m]n.Symbol He （名词）符号 He A colorless, odorless inert gaseous element occurring in natural gas and with radioactive ores. It is used as a component of artificial atmospheres and laser media, as a refrigerant, as a lifting gas for balloons, and as a superfluid in cryogenic research. Atomic number 2; atomic weight 4.0026; boiling point &9{-}268.9&9{=}C; density at 0&9{=}C 0.1785 gram per liter.See table at element 氦：自然界天然气体或放射性矿石中一种无色、无味的惰性气体状成分。用作人造大气层和镭射媒体的组成部分，和用作制冷剂及飞行气球的气体，还在低温学研究中用作超流体。原子序数2；原子量4.0026；沸点-268.9&9{=}C；浓度在0&9{=}C时为每升0.1785克参见 element语源:From Greek h¶lios [sun (so called because its existence was deduced from the solar spectrum)] * see s³wel- 源自 希腊语 h¶lios [太阳（该元素的存在首先是在太阳光谱中测得，故名）] *参见 s³wel- |
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