这颗恒星曾和太阳一样，是颗“主序星”(“main sequence”)。它通过核聚变燃烧氢，从而产生氦。
The star used to be like the sun, a "main sequence" star that burns hydrogen by nuclear fusion, producing helium.
最好的核聚变材料有两种，即氢的同位素——氘和氚。
The best fuels for fusion are two types, or isotopes, of hydrogen - deuterium and tritium.
大阳的能量不是来自燃烧过程，而是来自由氢到氦的核聚变，是部分由一个涉及碳和氮的复杂过程引起的。
The energy of the Sun arises not from any burning process but from nuclear fusion, the transformation of hydrogen into helium, in part by a complicated process involving carbon and nitrogen.
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