This extended use of the execution flow notation is motivated by the need to provide a hierarchy of data representation, which is necessary for large-scale, distributed traces.

这种扩展的主要原因是在大型分布式应用程序的跟踪时需要提供分层次的数据表示形式。

The information link between PLC and computers is adopted to perform the complicated control of notation scale.

采用PLC与计算机之间的通讯链接技术，完成交通对象的复杂控制。