Firstly we present basic concepts about definitions for object dependency (OD) and key and so on. Then we discuss some properties for OD.
首先给出有关对象依赖（OD）和关键字等的基本概念，然后讨论对象依赖的一些性质；
The procedures to divide bi-directional flows into two single directional flows are discussed. The formulae for OD flow calculation are derived.
并描述了将双向交通流分解为单向交通流进行推算的过程，给出了通道OD递推公式和相应条件。
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