PR：需要先决条件

在学术和高等教育领域，“Prerequisite Required”（需要先决条件）常缩写为“PR”，以方便书写和使用。该术语多用于描述课程或学习任务的前置要求，确保学生具备必要的基础知识，从而顺利进入下一阶段的学习。

The contents of Multi-level college English courses of Ningbo University are rich and diversified, which composed by seven parts : prerequisite course, required course, intensified training course on weekends, selective course, minor course, bilingual course, ESP course.
宁波大学的大学英语立体课程体系包涵七部分：预修课程、必修课程、周末强化课程、选修课程、辅修课程、双语课程及专门用途英语课程，其课程内容具有广泛性及多层次性。
Molecular oxygen is the terminal electron acceptor in the mitochondrial electron transport chain and is also the prerequisite conditions that are required by higher plants during their growth and development.
氧是线粒体电子传递链的末端受体，是高等植物正常生理代谢和生长发育必不可少的条件。
1.Under the prerequisite of assuring the geometry size required by the crane, the position of crane can make the crane have the maximum lifting capacity.
这两种最佳位置是：1.在保证吊装所需几何尺寸的前提下，使吊车具有最大吊装能力的位置；
Soil erosion course is required as prerequisite for this course, basic skill in estimating soil loss using Universal Soil Loss Equation is also required.
本课程需要先行修过土壤冲蚀的基础课程，并必须了解通用土壤流失公式如何估算土壤流失量的原理。

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