a spectrum in which energy is concentrated at particular wavelengths; produced by excited atoms and ions as they fall back to a lower energy level
双语例句
1
Got some rules can not be observed in the frequency spectrum: there are some linespectrums that have a certain relationship with the fundamental frequency.
得到了一些在频率谱图中无法观察到的规律：存在一些与基波频率有着一定关系的线谱。
2
Other light spectrums move at a straight line from the Sun, which is over the horizon, thus not arriving at our eyes.