问题不在于整张照片的光线偏暗（之后我们会谈到这一点），而在于一个场景里有的地方非常明亮而另一些地方非常黑暗。
The big problem is not necessarily that it is dark (we'll talk about that in a minute) but that the scene is so bright in some places and dark in others.
极光，正如我们所说，跟磁场没有一点关系而是由于引力而弯曲的光线。
The Auroras, as we have stated, are not magnetic at all but light rays bent by gravity.
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