spectrum

n.光谱，频谱；领域，范围

specious, speciously, speciousness, speck, speckle, speckled, specs, spectacle, spectacled, spectacles, spectacular, spectacularly, spectator, spectator sports, spectral, spectre (US specter), spectro-, spectrometer, spectroscope, spectroscopic, speculate, speculate on, speculation, speculation about, speculative, speculator, sped, speech, speech therapist, speech therapy, speech-day, speechify, speechless, speechlessly, speechlessness, speed, speed limit, speed merchant, speed trap, speed up,