单词	包络速度
释义	同包络速度--群速度
随便看	the cheek bones the chemical brothers the chest the chief among ten thousand the chief city or metropolis of a province the chief clerk in a mercantile house the chief corner stone (mostly used in regard to men) the chief director of the imperial guards the chief magistrate of a country the chief mate the chief of a clan the chief of devils the chief officers of the six boards the chief or criminal judge of a place the chief or main point the chief physician the chief priest, in an idol temple the chief secretary of state the chief substance the chieftain of bandits the chief town of a district the chief town of a prefecture the chief town of a province the chief town of a state the child is father of the man.