- A system of operation in which each operation is performed singly and not at the same time that other tasks are being completed, i.e., the work moves along a single line or channel where one type of operation is performed in succession. No tasks are performed simultaneously with other tasks.; 一种(系统)操作方式，其中每个操作都是单独执行的，且在同一时刻不会同时执行其它任务，即沿着单条路线和通道工作， 其中任一类型的操作都是依次逐个执行的，任一任务都不会与其它任务同时进行。
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