Another useful method for new applications is to work backward.
对于新的应用程序，另一种有用的方法是反向推导。
The go method, defined in Listing 4, will allow us to move backward and forward in the stack.
清单4中定义的go方法允许我们在堆栈中来回移动。
In reasoning mechanism, two kinds of strategy: heuristic forward and backward reasoning method are adopted, and blackboard structure which is a common dynamic data area being applied.
在推理机构中，采用两类策略：启发式正向和反向推理方法，并利用黑板结构作为公共动态数据区。
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