speed

n.速度；快，迅速 vi.急行 vt.加速

spectro-, spectrometer, spectroscope, spectroscopic, spectrum, speculate, speculate on, speculation, speculation about, speculative, speculator, sped, speech, speech therapist, speech therapy, speech-day, speechify, speechless, speechlessly, speechlessness, speed limit, speed merchant, speed trap, speed up, speed-boat, speed-indicator, speed-up, speedboat, speedily, speediness, speeding, speedometer, speedway, speedwell, speedy, speleological (also spelaeological), speleologist (also spelaeologist), speleology (also spelaeology), spell, spellbinder,