/ˈspɛktrəm/
a band of coloured lights in order of their wavelengths, as seen in a rainbow and into which light may be separated 谱；光谱
A spectrum is formed by a ray of light passing through a prism.
一束光通过棱镜就会形成光谱。
Red and violet are at opposite ends of the spectrum.
红色和紫色位于光谱的两端。
[usually singular] a complete or wide range of related qualities, ideas, etc. 范围；各层次；系列；幅度
a broad spectrum of interests
广泛的兴趣范围
We shall hear views from across the political spectrum.
我们要听取各个政治派别的看法。