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）prepenial阴茎前位

1. In this paper the survey and recent development of the technique for preparing Neodymium-iron alloy are reviewed.
   本文综述了钕铁合金制备技术的概况及最新进展。
2. In this paper, preparation techniques of cationic dispersed rosin size based on polymeric emulsifying and dispersing agents were preliminarily reviewed.
   该文介绍了基于聚合物类乳化与分散剂的阳离子分散松香胶的制备技术的基本状况。