短語詞組短語backward d chaining 反向鏈接backward chaining problem solver 反向煉接問題解答器;向后鏈接問題求解程序backward chaining procedure 逆向鏈接過程backward chaining inference method 后向串連推論法Forward and Backward Chaining 正反向混合推理backward chaining control 反向煉接控制backward chaining manner 反向煉接方式Modified Backward Chaining 修正反向鏈Backward chaining reasoning 逆向鏈推理 返回 backward chaining