1.【化】氦
1.a gas that is lighter than air, often used for lifting large balloons
1.He sat down in his lawn chair. Attached to his lawn chair were 105 large helium balloons.
他坐在草坪椅上，椅子系著一百零五颗灌满氦气的大气球。
2.The sun is relatively young, part of a generation of stars known as Population I, which are relatively rich in elements heavier than helium.
太阳相对来说还年轻，属于我们所谓的I类恒星，这类恒星中的比氦重的元素相对丰富一些。
3.Nearly all their mass is made up of hydrogen and helium, giving them compositions like that of the sun.
它们的几乎全部质量都由氢和氦贡献，这使得它们的组成成分与太阳类似。
4.Just a little British ingenuity that saw a standard digital camera taped to a helium balloon and floated into the sky.
只需要点英国人的小智慧，将一个绑在氦气球上的标准数码相机飘入天空，万事俱矣。
5.The star used to be like the sun, a "main sequence" star that burns hydrogen by nuclear fusion, producing helium.
这颗恒星曾和太阳一样，是颗“主序星”（“mainsequence”）。它通过核聚变燃烧氢，从而产生氦。
6.I have here a ball-- you may call it a balloon, but I call it a ball because there's no helium in it.
这里有个小球-，你也会叫它气球，但是我叫它球，因为里面没有氦。
7.So helium was first discovered on the sun before it was later discovered on Earth by looking at the absorption lines of the solar spectrum.
氦元素首先在太阳上，发现，后来，在地球上发现，通过观察太阳光谱，中的吸收线。
8.When the universe was born, there was nothing but hydrogen, helium and a little lithium.
当宇宙诞生的时候，除了氢、氦和少量的锂元素之外，什么也没有。
9.The image was captured using four narrow-band filters that have been tuned to see hydrogen as well as ionized helium, sulfur and oxygen.
获取该图像时使用了四个窄带滤光片，它们都被调谐到可见氢、电离氦、硫和氧。
10.When the helium content is less than 45%, the character of tri-mixed gas has no evident difference compared with that of argon.
混合气体中氦气的体积百分比小于45%时，其电弧特性与氩弧差别不大。