Claude Shannon proposed instead that programs should cut off the search earlier and apply a （）evaluttion function to states in the search, effectively turning nonterminal nodes into terminal leaves.克劳德·香农提出：程序应该早一些剪断搜索，并在搜索中对状态应用（）评价函数，有效地将非终端节点转换为终端叶节点。（

Claude Shannon proposed instead that programs should cut off the search earlier and apply a （）evaluttion function to states in the search, effectively turning nonterminal nodes into terminal leaves.克劳德·香农提出：程序应该早一些剪断搜索，并在搜索中对状态应用（）评价函数，有效地将非终端节点转换为终端叶节点。（请填写中文答案）
正确答案：启发式