求翻译：在制订网络计划时，无论是以降低费用为主要目标，还是尽量缩短工程完工时间为主要目标，都要计算最低成本日程，从而拟定出时间-费用的优化方案（李涛，2007）。是什么意思？

The development of network planning, whether it is to reduce costs as the main goal, or try to shorten the project completion time as the main goal, we must calculate the minimum cost schedule, which developed out of time - the cost of the optimization program (Tao, 2007).

In network planning, whether it is a lower cost to be the primary goal is to minimize the Completion Time is the main goal is to be calculated, at minimum cost, and schedule time to develop a cost-optimized programs (Lee, 2007).

When making network planning, regardless of is take reduces the expense as the essential target, reduces the project completion time is the essential target as far as possible, all must calculate the most low cost program, thus draws up the time - expense the optimization plan (Li Tao, 2007).

In developing network plans, both to reduce costs as the main target, or try to shorten the completion time for the main target, to calculate the minimum-cost schedule, so as to develop time-cost optimization (Li Tao, 2007).

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