network graph的用法和樣例：
例句
- This chapter developed the concept of breaking down a project into activities in order to draw its graph, or network.
這一章提出將一個工程項目分解為若干工作這一概念，其目的是便於繪製網路圖。 - We give the proof about the optimality criterion and describe an efficient algorithm for piecewise linear fractional programs on the network.
為進一步解決網路圖上非線性目標函數的優化問題提供了依據。
