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。

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.

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太阳的外层大气称为日冕，那里的温度比光球层(即我们所看到的太阳表面)的温度要高好几百度。

The Sun's outer atmosphere is called the corona and it is several hundreds of times hotter than the photosphere, or the visible surface of the star.

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太阳大气则由光球层、色球层、过渡区和日冕组成。

The solar atmosphere above that consists of the photosphere, chromosphere, a transition region and the corona.

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