结构可以嵌套，但这一示例包含了每一个基本有效性概念。
Structures can nest, but every basic validity concept is included in the example.
然而，研究文献业已表明，有效性概念已有不同含义。
But researches have shown that validity concept have had different meanings.
有效性是论证或推理理论的核心概念。
The validity is a central concept of theory of argument or reasoning.
不同有效性概念的阐明，为的是给一般论证提供更适切的评估规范。
Different validity has been expounded for offering appropriate standard of assessment to general argument.
本文分析了中文词汇在联想中的规律，提出联想有效性的概念。
This paper analyses the law of Chinese words association in text.
本文分析了中文词汇在联想中的规律，提出联想有效性的概念。
This paper analyses the law of Chinese words association in text.
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