Any candidate row for step (n + 1) that already exists in the ancestor path is simply ignored. In Oracle, the usage looks like this.

对于第(n + 1)步，任何在祖先中已经存在的候选行都将被忽略。

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David N. Keightley, a historian at the University of California, Berkeley, told me that he's particularly struck by how oracle-bone inscriptions convey a sense of hierarchy and order.

加利福尼亚大学伯克力分校的历史学家大卫·N·凯特利告诉我，甲骨刻辞传达了那么多的等级观念和规矩，这给他的印象尤为深刻。

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