The empirical methods in the manual procedures may be elucidated by some tentative control strategies of artificial intelligence (AI), namely, hierarchical planning and backtracking.

人工排课步骤中所使用的各种经验方法，可以用人工智能中的分级规划及回溯等试探性控制策略予以阐明。

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For decades researchers have tried replicating the top-down, hierarchical model of the human brain to create artificial intelligence in computers, without success.

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