本文在对“王氏代数”、“k -树组”和“MINTY”这三种求有向树组的典型方法进行分析之后，提出了一种生成有向树组的拓扑方法。

Having analysed the "W-algebra", "K-tree terms" and "MINTY", the three typical methods of generating direct tree terms, the paper advances a new topological one.

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Plato undertook three long and dangerous voyages to Sicily in order to advise the King Dionysius.

柏拉图三度冒险渡海至西西里岛,只为向戴奥尼索斯王献策；

耶鲁公开课 - 政治哲学导论课程节选