This paper discusses the theory of paral-lel data accessing, introduces the whole system structure and the method of parallel preprocessing and edge trac-ing, and also offers some examples of edge tracing. 论述了并行数据存取原理,介绍了边界跟踪系统的整体结构以及并行预处理、并行跟踪的方法,给出了边界跟踪的实例。
And this structure is required for the function of ParAl. 此种结构对于ParA1的功能行使是必要的。