helium
英['hiːliəm] 美['hiːliəm]
helium is a very light gas.
氦是一种非常轻的气体。
helium is a gas used in balloons.
氦是一种用于气球的气体.
Unlike helium - 4, it cannot be produced by radioactive decay.
与氦 - 4不同之处是, 氦-3不能由放射性衰变产生.
The helium - 3 apparently became trapped when the earth was formed.
显然,当地球形成时,氦 - 3就被圈闭了.
After hydrogen, the atom with the simplest structure is that of helium.
在氢元素之后, 氦的原子结构最简单.
Hydrogen might be depleted with some of it turning into helium.
氢可能被耗尽,一部分变为氦.
The discovery also explains why helium is found in radioactive mineral deposits.
这个发现也解释了为什么在放射性矿渣中找到了氦.
A fountain of helium spurt out of the tube.
有一股氦的喷泉从小管中喷出.
Alpha particles are positively charged helium nuclei obtained from natural radioactive decay.
α粒子是从天然放射性蜕变得到的带正电的氦核.
The bizarre behavior of superfluid helium has attracted many able theorists.
超流体氦这些异乎寻常的行为吸引了许多有才干的理论物理学家.
helium is a noble gas.
氦气是惰性气体.
helium and neon are inert gases.
氦和氖为惰性气体.
Most big balloons are now filled with helium.
现在许多大气球中充的是氦气.
helium and neon measurements provide further evidence that the earth was not completely melted.
氦和氖的测定,提供了更多的关于地球并非全部熔融的证据.
Alpha particles -- helium nuclei -- were being hurled through the tube, in which an artificial mist had been created.
粒子 —— 氦核 —— 正通过试管被抛出, 从而在试管中形成人造迷雾.
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