想象一下在星期三我疲惫不堪的大脑：“我必须使这项设计最优化，但我必须在周五之前完成而且不能花超过十五个小时的时间。”
Picture my frazzled brain by mid-week: "I must get this design optimised, but I must get it done by Friday and not spend any more than 15 hours doing it."
所谓排序，就是在一定的约束条件下分配时间资源去完成一些任务，使一个或多个目标达到最优。
Scheduling is to assign some tasks to time resources under some constraints, such that one- or multi-criteria attain to the optimum.
完成的工件按照批次进行送货，所有在公共交货期前完工的工件在最优交货期时间一起交付，对批次送货没有量的约束。
Finished jobs are delivered in batches and all the jobs completed before or at the due date are delivered in a batch at the optimal due date. There is no capacity limitation on a batch delivery.
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