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(physics) spectroscopy
Spectroscopy is an important means of investigating the properties of matter.
a spectral characteristic
We conducted a spectral analysis to investigate the spectral characteristics of this substance.
spectroscopy (scientific study of spectra)
spectrometer
You can use a spectrometer to examine the composition of a substance.
state of emergency (governmental decree)
The government declared a state of emergency to prevent the spread of the new coronavirus.
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