It contained very little hydrogen and helium.
它含有非常少的氢和氦。
Stars like our sun fuse hydrogen in their cores into helium.
太阳一类的恒星在其核心将氢聚变成氦。
A regulatory agency should ensure that helium is used carefully.
应该有一个监管机构确保氦的使用是谨慎的。
National Helium Reserve to liquidate its helium assets by 2015 regardless of the market price.
无论市场价格，国家氦储备局将在2015年之前清算其氦资产。
By selling the helium, the government can not only pay off that debt but reduce its overall debt as well.
政府通过出售氦不仅可以偿还债务，还可以减少总体债务。
Another important attribute is the unique boiling point of helium, which is lower than that of any other element.
另一个重要的特性是氦的独特沸点，比其他任何元素的沸点都低。
The pressure of the helium inside a blimp is about the same as that of the air outside, so the gas does not rush out.
气球飞艇内部氦气的压力和外部气压相近，因而气体不会溢出。
In fact, 24 per cent of our galaxy elemental mass consists of helium, which makes it the second most abundant element in our universe.
事实上，银河系中24%的元素质量是由氦组成的，这使它成为宇宙中第二丰富的元素。
All existing supplies of helium ought to be conserved and released only by permit, with medical uses receiving precedence over other commercial or recreational demands.
现有的所有氦供给应该被保存下来，并且只有在获得许可的情况下才能释放，医疗用途优先于其他商业或娱乐需求。
Firstly, all existing supplies of helium ought to be conserved and released only by permit, with medical uses receiving precedence over other commercial or recreational demands.
首先，所有现有的氦供应应该被保存下来，并且只有在获得许可的情况下才能释放，医疗用途应优先于其他商业或娱乐需求。
The Congress is ignorant of the consequence of fire sale: global helium prices are so artificially deflated that few can be bothered recycling the substance or using it judiciously.
国会对廉价出售的后果一无所知：全球氦气价格被人为压低，以至于几乎没有人愿意回收这种物质或明智地使用它。
However, the amount of helium in the universe, as measured by spectroscopy, suggests that there are far more baryons in the universe than estimates based on galactic luminosity indicate.
然而，通过光谱学测量，宇宙中氦的数量表明，宇宙中重子的数量要比基于星系光度所估计的要多得多。
GIANT inflatable helium balloons.
巨大的充气氦气球。
If helium loses on electron, what do we have?
如果氦原子失去了一个电子，我们得到了什么？
The balloon may be filled with helium or hydrogen.
气球中可能会充满氦气或者氢气。
One class of white dwarfs has almost pure helium atmospheres.
有一类白矮星的大气层几乎完全由纯氦气构成。
Using helium as a coolant has at least a couple of advantages.
用氦气作冷却剂至少有一些好处。
They would form helium and a subatomic particle, called a neutron.
聚变后形成氦以及一种称为“中子”的亚原子粒子。
THE NEXT GENERATION of nuclear plants may be cooled by gas-helium gas.
下一代核电站或许通过气体——氦气——冷却。
And there he was able to identify the alpha particle as the helium nucleus.
他证实了，阿尔法粒子就是氦核。
The moon's lunar soil is chock-full of helium reserves, thanks to the solar wind.
由于太阳风，月壤充满了氦。
Just like most other stars, the sun is made up mostly of hydrogen, followed by helium.
就像大部分其它恒星一样，太阳主要由氢构成，其次是氦。
Alpha particles are these helium nuclei, and they are the result of radioactive decay.
阿尔法粒子是氦核，它们是放射性衰变的产物。
Did the star ignite helium at the core, swallow a planet, or swallow a companion star?
星体燃烧了核内的氦，吞并了行星或伴星吗？
And then we have gas cooled reactors which can use supercritical carbon dioxide or helium.
然后我们有气体冷却反应堆，那能使用超临界二氧化碳或者氦。
The machine sends pulses of antiprotons about every hundred seconds into cold helium gas.
机器每隔约100秒发送1个反质子脉冲进入到冷的氦气中。
The pebble has about a one millimetre microsphere diameter. The coolant is in fact helium.
卵石大约有1毫米的球径，冷却剂就是氦气。
Like its bigger neighbor Jupiter, Saturn is a gas planet made mostly of hydrogen and helium.
就像比它更大的邻居-木星一样，土星也是气体行星，主要由氢和氦所组成。
Like its bigger neighbor Jupiter, Saturn is a gas planet made mostly of hydrogen and helium.
就像比它更大的邻居-木星一样，土星也是气体行星，主要由氢和氦所组成。
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