Helium is a very light gas.

氦是一种很轻的气体。

Atoms of hydrogen are fused to make helium.

氢原子可熔合成氦。

Helium is a gas used in balloons.

氦是一种用于气球的气体。

It contained very little hydrogen and helium.

它含有非常少的氢和氦。

Hydrogen turns into Helium, which releases energy.

氢变成氦的时候会释放能量。

The loss of helium on Earth would affect society greatly.

地球上氦的减少将对社会产生重大影响。

So you are saying that Helium was discovered on the sun first.

所以你是说，氦最初是在太阳上被发现的。

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。

Deflated values also mean that natural gas extractors see no reason to capture helium.

放气值也意味着天然气提取器认为没有捕获氦的需要。

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。

Helium is the by product of millennia of radioactive decay from the elements thorium and uranium.

氦是钍和铀元素数千年放射性衰变的副产品。

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。

The Jovian planets have very thick atmospheres consisting of varying amounts of hydrogen, helium, methane, and ammonia.

木星的行星有非常厚的大气层，且由不同数量的氢、氦、甲烷和氨等元素组成。

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。

The inner envelope filled with helium in the head section of the blimp and the third built-in airbag at the tail is filled with ethane combustible gas.

飞船头部的内置气囊中充满了氦气，而置于尾部的第三节内置气囊则充满了乙烷可燃气体。

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。

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。

GIANT inflatable helium balloons.

巨大的充气氦气球。

Where did this man get the helium?

这个人是从哪儿得到氦气的呢？

So what is the charge on a helium nucleus?

那么氦原子核的电荷量是多少呢？

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。

When it decays, it becomes a stable form of helium.

当它衰变时，它以稳定的氦气形式存在。

Clearly, helium has the least polarizable electron cloud.

显然，氦的可极化电子云最小。

Previous observations had traced only incoming helium atoms.

以前的观测只追踪了氦原子。