因?yàn)?/c>里面沒(méi)有氦。
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.
氦元素首先在太陽(yáng)上，發(fā)現(xiàn)，后來(lái)，在地球上發(fā)現(xiàn)，通過(guò)觀(guān)察太陽(yáng)光譜，中的吸收線(xiàn)。
When the universe was born, there was nothing but hydrogen, helium and a little lithium.
當(dāng)宇宙誕生的時(shí)候，除了氫、氦和少量的鋰元素之外，什么也沒(méi)有。
The image was captured using four narrow-band filters that have been tuned to see hydrogen as well as ionized helium, sulfur and oxygen.
獲取該圖像時(shí)使用了四個(gè)窄帶濾光片，它們都被調(diào)諧到可見(jiàn)氫、電離氦、硫和氧。
When the helium content is less than 45%, the character of tri-mixed gas has no evident difference compared with that of argon.
混合氣體中氦氣的體積百分比小于45%時(shí)，其電弧特性與氬弧差別不大。
The force between a pair of helium atoms is so weak that helium does not solidify at all.
一對(duì)氦原子之間的作用力微弱得使氦根本不能固化。
He also invented the Skyhook, an air rescue system that involved an airplane and a large helium balloon.
他還發(fā)明了高空吊運(yùn)車(chē)，這是一種為飛機(jī)和大型的氦氣球的空中救援系統(tǒng)。
The way these pebble bed reactors work is the helium comes in up the side and down through the pebble bed. It's not a fluidised bed.
這些卵石層反應(yīng)堆運(yùn)作的方式是，氦從這面的上面進(jìn)來(lái)，然后，通過(guò)這個(gè)卵石層再出去，這不是液化層。
They observed the oscillations of the helium as it twisted back and forth on the end of a metal rod.
他們讓氦在金屬桿兩端前后扭動(dòng)，觀(guān)察它振蕩的情形。
Look at it again! We gave him an argon- helium cryoablation for his lung cancer.
再來(lái)看一看，我們又給他做了肺癌的一個(gè)氬氦冷凍消融治療。
Astronomers ascribed them to thermonuclear fusion of hydrogen or helium or to the sudden accretion of matter onto the star.
天文學(xué)家因此可將其歸因于氫或氦的熱核融合反應(yīng)，或是有物質(zhì)突然被星體吸附而產(chǎn)生的。
Why is america wasting its helium? and what is the metal that you were talking about I've never heard of it.
為什么美國(guó)在浪費(fèi)鉿？你說(shuō)的鉿是什么東西，我從來(lái)沒(méi)聽(tīng)說(shuō)過(guò)。
Other probes might be sent skimming by Jupiter's atmosphere to collect helium, a valuable gas that Earth may run out of some day.
另外，我們還希望派遣探測(cè)船掠過(guò)木星的大氣層，收集里面珍貴的氦氣，以備未來(lái)地球上的氦氣用完時(shí)使用。
As the sun burns, the hydrogen in its core converts to helium by fusion, a process through which the nuclei of atoms meld together.
當(dāng)太陽(yáng)燃燒時(shí)，內(nèi)核的氫通過(guò)核聚變轉(zhuǎn)化成氦，這是一個(gè)原子核合并的過(guò)程。
Betty's helium-filled aerostat, three metres across, is capable of carrying loads of a little over half a kilo.
Betty充滿(mǎn)氦氣的氣囊直徑3米，能夠負(fù)載0.5千克或稍多的重量。
The next element above hydrogen, as we go from the simplest to the most complicated element, is helium.
當(dāng)我們以最簡(jiǎn)單到最復(fù)雜按順序考查原子時(shí)，比氫復(fù)雜的其次一個(gè)元素就是氦。
Helium was discovered on the sun.
氦是在太陽(yáng)上發(fā)現(xiàn)的。
The material of this nebula was more than 99% hydrogen and helium, the two simplest elements.
星云中含有超過(guò)99%氫和氦，這些元素在宇宙形成之初就已經(jīng)存在。
Helium 3 is not hazardous or even chemically reactive, and it is not the only material that can be used for neutron detection.
氦3的化學(xué)性質(zhì)不活潑，是安全的化學(xué)物質(zhì)，它并不是制造中子探測(cè)器的唯一原料。
An increased ADC value indicates that the helium atoms were able to travel farther during the measurement time.
ADC值的增加提示氦原子在測(cè)定過(guò)程中擴(kuò)散到了更遠(yuǎn)的距離。
Another team, ASACUSA, is studying exotic helium atoms in which one electron is replaced by an antiproton.
還有另外一個(gè)ASACUSA團(tuán)隊(duì)，則是研究一種奇特的氦原子（反質(zhì)子取代了其中一個(gè)電子）。
The output of light and heat of the Sun requires that some 600 million tons of hydrogen be converted into helium in the Sun every second.
太陽(yáng)所產(chǎn)生的光和熱需要每秒將六億噸氫轉(zhuǎn)化為氦。
Thousands of cubic metres of helium were pumped into the towering silver canopy of His balloon.
數(shù)千立方米的氦氣被灌入高達(dá)幾米的銀色氣球中。
That left the star with only its helium core, which was a third of the sun's diameter and bore a quarter of its mass.
這樣，該恒星只剩下氦核了，這個(gè)氦核有太陽(yáng)直徑的三分之一，太陽(yáng)質(zhì)量的四分之一。
Helium, the second most abundant element in the universe after hydrogen, is one of the main ingredients of star formation.
氦是宇宙都僅次于氫的第二多元素，是形成恒星的主要原料。
Robert Richardson, a Nobel Prize winner, warns helium supplies, commonly used in balloons, will run out in 25 years.
諾貝爾獎(jiǎng)得主羅伯特·理查森警告稱(chēng)，通常被用作灌注氣球的氦氣將在25年內(nèi)耗盡。
The next heaviest element in the periodic table, the inert gas helium, is used for detecting cracks in pressure vessels and the like.
在元素周期表中，接下來(lái)的更重些的元素是惰性氣體氦氣，它常被用作檢測(cè)壓力容器和其他類(lèi)似東西的裂縫。
A helium line unexpectedly vented, eventually leading ground support crews to a ring that had come loose from a seal.
一根氦管路意外泄露，最后地面支持人員發(fā)現(xiàn)問(wèn)題源自一個(gè)松動(dòng)的密封環(huán)。
The cooling and shrinking continued until hydrogen and helium began to fuse igniting the fusion engine that powers our sun and other stars.
這種冷卻和收縮一直持續(xù)，直到氫和氦完全結(jié)合在一起，點(diǎn)燃聚變的引擎。我們的太陽(yáng)和其他恒星就是這樣獲得能量的。
After hydrogen, helium is the second most common element in the universe, with the bulk of it formed during the big bang.
繼氫之后，氦作為宇宙第二大常見(jiàn)元素，在宇宙大爆炸時(shí)期大量產(chǎn)生。
Bloon will carry passengers in a pod suspended beneath a large helium balloon, or sail, as it is called.
Bloon將使用懸掛在一個(gè)大的氦氣球或行船下的分離艙載人，據(jù)它所說(shuō)。
Born roughly a billion years ago, it once generated energy as the sun does, converting hydrogen into helium at its core.
該恒星大約誕生于10億年以前，一度像太陽(yáng)那樣產(chǎn)生能量，在恒星核處將氫轉(zhuǎn)換為氦，當(dāng)恒星核處充滿(mǎn)了氦之后，該恒星變成了紅巨星。
Using helium as a coolant has at least a couple of advantages.
用氦氣作冷卻劑至少有一些好處。
When the Sun ignited in the solar nebula, hydrogen, helium and other volatile materials were evaporated in the area near the Sun.
當(dāng)太陽(yáng)在太陽(yáng)星云被點(diǎn)燃時(shí)，臨近太陽(yáng)附近的氫、氦和其他易揮發(fā)物質(zhì)都成為蒸汽。
Nuclear reactions in such a star's core, the source of power for nearly its entire life, deplete the available hydrogen, then the helium.
恒星一生的能量來(lái)源，幾乎都來(lái)自中心的核反應(yīng)，過(guò)程中會(huì)耗盡所有可用的氫，然后是氦。
However, there is a very attractive reaction between deuterium and a light isotope of helium known as helium-3.
無(wú)論如何，在氘和一個(gè)氦的輕同位素也就是氦-3之間有一種吸引人的反應(yīng)。
Which turns four hydrogen nuclei to a helium nucleus. The star will have a convective shell and a radiative core just like our own Sun See.
進(jìn)行，將四顆氫原子核結(jié)合為一顆氦原子核，恒星會(huì)有輻射核心和一個(gè)對(duì)流外殼就像我們的太陽(yáng)。
英 [?hi?li?m] 
