铁路行车调度问题是一个复杂的劣构问题。
Railway traffic control is a complicated and ill-structured problem.
传统教学设计在劣构领域表现出力不从心，学习者劣构问题解决能力停滞不前。
Traditional design models lack the effective instructional strategy for ill-structured domains instruction, and the students'ability to revolve ill-structured problems is stagnant.
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