mediumrare半生的mediumadj.中等的；适中的n.手段；媒介；媒体medium hardboard中密度级硬质纤维板medium selection媒介选择medium-grained中粒的,中等粒度的medium education中专medium artillery中型炮medium flat file中扁锉medium viscosity中粘度medium lift lock中水头船闸medium formation媒材形态medium annealing中温退火