These absences are called Fraunhofer lines, after the German physicist who discovered them two centuries ago.

这些缺失的频率被称为夫琅和费谱线，200年前，德国物理学家发现了它们。

He didn't know exactly why this happened but concluded that Fraunhofer's black lines were caused by elements in the sun absorbing specific wavelengths.

他不知道为什么会发生这种情况，但他得出结论，弗劳恩霍夫的黑线是由太阳中的元素吸收特定波长引起的。