spectrum /ˈspɛktrəm/ noun plural spectra /ˈspɛktrə/ or spectrums plural spectra /ˈspɛktrə/ or spectrums Learner's definition of SPECTRUM
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1
a : the group of colors that a ray of light can be separated into including red, orange, yellow, green, blue, indigo, and violet : the colors that can be seen in a rainbow光谱 b technical : an entire range of light waves, radio waves, etc.波谱;频谱
2
: a complete range of different opinions, people, etc.范围;幅度 —
often + of