求翻译：光谱学的研究在原子结构理论的发展过程中是绝对不可或缺的。光谱学的研究成果对原子结构理论的建立奠定了坚实的实验基础，早在19世纪末，光谱学已经积累了大量实验数据资料。人们发现由一定频率成分构成的特征光谱，它们是一条条离散的光谱线，被称为线状光谱，即原子光谱。是什么意思？

Spectroscopic studies in the theory of atomic structure of the development process is absolutely essential. Spectroscopic studies that the outcome of the establishment of the theory of atomic structure and laid a solid experimental basis as early as the late 19th century, spectroscopy has accumulate

spectroscopic studies of the atomic structure of the theory in the development process is absolutely essential. spectroscopic studies of the results of theoretical atomic structure of a solid empirical basis, as early as the 19th century, mass spectroscopy has been accumulating a large experimental

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Spectroscopic studies of atomic structure theory in the process of development is absolutely essential. Spectroscopy research on experiments of the establishment of the theory of atomic structure has laid a solid foundation, as early as the end of the 19th century, spectroscopy has accumulated a lar

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