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。
The files shall be numbered by calendar year plus serial number in the natural sequence of Arabic numerals representing order of release.
文件号应以日历年为编号单位，并以连续阿拉伯数字作为序列号从小至大表明发文先后顺序。
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