pretrn.前置收发开关PREabbr.Petroleum Refining Engineer炼油工程师prefetch time预取时间prekallikrein前激肽释放酶,激肽释放酶原predeflection预偏转,偏转之前pre-stowage预配premordial qi金男preterminfant早产儿pre-warningn.预警preinitiation提前起爆；始发前pre-plating预镀predetonation预爆轰[震]