单词	四速度
释义	四速度four-velocity双向☞古典速【程】度四量--四速度
随便看	universal button box universal calender universal calibration universal camera control system universal camera control system--uccs universal camera control system，uccs universal card read-in program universal chain control universal character universal character buffer universal character buffer address register universal character buffer address register，ucbar universal character buffer，ucb universal character set universal character set--ucs universal character set，ucs universal chock universal chromatograph universal chuck universal city universal clamp universal class universal class card reader universal classification system universal classification system，ucs