You might need to construct the source data models by using reverse engineering techniques, developing Entity and Relation (er) models from existing source databases.

您可能需要通过使用逆向工程(reverse engineering)技术构造源数据模型，从而从现有的源数据库中开发实体和关系(Entity and Relation, er)模型。

youdao

Logic's two independences in the valid sufficient condition relation originated from sufficient conditional relation of experience, and in reverse it also serves empirical science.

逻辑有效充分条件关系中的逻辑的“两个独立性”源自经验的充分条件关系，又回过头来为经验科学服务。

youdao

Finally authors gave a succinct algorithm of kinship relation reasoning, including connection, reverse and simplification operation.

最后，给出一种简洁的亲属关系转换算法，主要包括连接、求逆、化简和组配等运算。

youdao