The dot (.) is now known as the context item expression, and might be a node or an atomic value, depending on the current item in the sequence being processed.
点号(.)在这里称为上下文项表达式，可以是节点或者原子值，视处理的序列中的当前项而定。
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。
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。
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