spectra
spectra — noun
1. the plural form of spectrum — used when referring to more than one spectrum, whe
the plural form of spectrum — used when referring to more than one spectrum, whether of light, sound, energy, or other ranges of related things
The telescope collected spectra from three distant stars during the night.
plural subject + plural verb 'collected'
These spectra show the chemical makeup of several unknown gases in the atmosphere.
demonstrative 'these' with plural noun
The chemistry students compared the infrared spectra of two different plastics.
Scientists use the spectra of stars to find out what elements they contain.
The research team published the optical spectra of fifteen newly discovered minerals.
文法句型
spectra + plural verb
用法筆記
Always use 'spectra' (not 'spectrums') as the plural of 'spectrum'. For a single range or distribution, use the singular 'spectrum'. See the main entry at 'spectrum' for full definitions, examples, and related word forms.