preparationsn.准备，准备工作，配制剂（名词preparation的复数形式）preparationn.准备；预备；配制preparation in advance预先准备preparation completion准备完成Preparation tectmology制备工艺preparation - method制备方法preparation techniques制备工艺preparation employment预就业preparation facilities调制设备preparation experiment制备实验preparation parameters制备参数preparation technology制备工艺