The paper discusses the hydraulic schematic CAD means which can use computer mouse to map out hydraulic element graphblock to lap the hydraulic system.
系统论述了液压原理图的CAD方法，实现了通过计算机鼠标绘制液压元件图形块进行液压系统原理图的搭接。
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An optional block can contain any graph pattern, not just a single triple as shown in Listing 6.
可选块可以包含任何图形模式，不仅仅是像清单6所示的那种单一的三元模式。
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Optional blocks can also be nested, in which case the inner optional block is only considered when the outer optional block's pattern matches the graph.