preparn.盐酸羟苄羟麻黄碱
prepn.准备; 预备学校; <非正式>课外作业v.进预备学校; 预备; 准备abbr.准备(=preparation)abbr.介词(=preposition)
prepaid ticket advice预付票款通知单
preplanting treatment种前整地
preprocessing circuit预处理电路
prepositive procedure前置程序
prepotential reflexes本能反射
prepacked with grease预装润滑脂
preparing the classes备课
prepaid coupon system预售书券制
preparing the lessons备课
preproduction vehicle预生产车