It has been a problem how to calculate the wagon turnround time for routine railway plan and statistics simply and conveniently in theory and practice.
铁路日常计划和统计中如何简便而准确地计算货车周转时间的问题，在理论和实践中一直是一个讨论的课题。
It has been a problem how to calculate the wagon turnround time for routine railway plan and statistics simply and conveniently in theory and practice.
铁路日常计划和统计中如何简便而准确地计算货车周转时间的问题，在理论和实践中一直是一个讨论的课题。
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