During the single dot cross operation, import the athuard ordinal number arrow, simplify the cross operation of the natural sequence.
在单点交叉过程中引入了逆序数向量进行交叉，简化了自然数序列的交叉过程。
According to the different features of the "ordinal meaning", the time sequence which stands for time point can be divided into two categories: the linear sequence and the cycling sequence.
根据不同的“顺序义”特征，表示时点的时间序列可以分为直线序列和循环序列两类。
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