linkage

In all, the nitrogen and carbon ligands, to be effective, require linkage to other electronegative centers.

总的来说，氮和碳配体如要有效，就需要连接上其它电负性中心。

This is useful to make a linkage and validate the relations between the Personas and the actual system actors that are determined (or possibly reverse-engineered) during the analysis phase.

建立连接并验证角色和分析阶段中确定的（或者可能是反向工程）实际系统参与者之间的关系是有用的。