helium

名词 helium:

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)
   同义词：He, atomic number 2

1. A colorless, odorless, tasteless, gaseous mixture, mainly nitrogen(approximately78 percent) and oxygen(approximately21 percent) with lesser amounts of argon, carbon dioxide, hydrogen, neon, helium, and other gases.
   空气一种无色、无嗅、无味的气体混合物，主要由氮气(约占78％)和氧气(约占21％)组成，还有少量的氩、二氧化碳、氢、氖、氦及其它气体

he.li.um

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 4.002'; boiling point -2'8.9=C; density at 0=C 0.785 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4.002'；沸点-2'8.9=C；浓度在0=C时为每升0.785克参见 element

来源：
From Greek hôlios [sun (so called because its existence was deduced from the solar spectrum)] * see s3wel-
源自 希腊语 hôlios [太阳（该元素的存在首先是在太阳光谱中测得，故名）] *参见 s3wel-