| 单词 | spectrum |
| 释义 | spectrum n. (pl. spectra) 1. the band of colours, as seen in a rainbow etc., arranged in a progressive series according to their refrangibility or wavelength. 2. the entire range of wavelengths of electromagnetic radiation. 3. a an image or distribution of parts of electromagnetic radiation arranged in a progressive series according to wavelength. b this as characteristic of a body or substance when emitting or absorbing radiation. 4. a similar image or distribution of energy, mass, etc., arranged according to frequency, charge, etc. 5. the entire range or a wide range of anything arranged by degree or quality etc. 6. (in full ocular spectrum) an after-image. Phrases and idioms spectrum (or spectral) analysis chemical analysis by means of a spectroscope. Etymology: L, = image, apparition f. specere look |
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