A star during most of its life is a main-sequence star, which consists of a core, radiative and convective zones, a photosphere, a chromosphere and a corona.
一颗恒星其生命的绝大部分处于主序星阶段，在这一阶段它包含一个核心、辐射区和对流区、光球层、色球层和日冕。
The sun is thought to be about 5 billion years old and halfway through its lifetime as a "main sequence" star.
太阳现在的寿命大约是50亿年，作为一颗“主序”恒星，也只是过了生命的一半。
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”(“main sequence”)。它通过核聚变燃烧氢，从而产生氦。
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