步骤是任务的序列，可以由同一角色不间断地执行。
A step is a sequence of tasks that can be performed without interruption by the same role.
在挖掘过程中，本文提出了一种新的挖掘松散的间断序列模式的算法。
In the mining process, we present a new algorithm of loose break sequence mining.
目前，在生产实际中，MRP系统是通过计算按时间分段的总需求和净需求，并以间断的时间序列来表达对物料的需求。
Currently, in the actual production, MRP system is calculated on a time span through sub-total demand and net demand, and to express the demand for materials with the intermittent time series.
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