单词	mixed crown
释义	mixed crown 混合冠
随便看	period of trade economy period of training period of transfomation period of transformation period of transition period of transmission period of transmitting current turn-off period of turnover period of two months period of unavailability period of unconsciousness period of uncovering period of unsteading infiltration period of usage period of use Period of vaidity of bids period of valcanization period of validity Period of validity of certification period of variable star period of verification period of vibration period of vigorous economic development period of wave period of waves