语言专属性、认知普适性、语言经验以及恒定的自然法则是语言习得能完美实现的主要因素。就语言本身的特点而言,语法结构隐而不显但却组织有序,而语言输入虽有外形但却零乱无章。就语法结构的本质而言,结构距离(而非线性序列)是语法机制唯一的最简计算对象。就语言研究而言,过度关注线性顺序无助于探讨语言结构的层级性本质,毕竟包括语言在内的所有生物体的成长和发展均以结构依存为其原始驱动力。Chomsky指出,对结构依存原则的深刻理解离不开主动求解的心态,更需要对习焉不察的语言现象生惑存疑。 Language specificity, universality of cognition, language experience and constant laws of nature are the main factors that make language acquisition perfect. In terms of the characteristics of the language itself, the grammatical structure is hidden but not obvious but orderly, while the language input is out of shape but messy. In terms of the nature of the grammatical structure, structural distance (rather than linear sequence) is the only simplest computational object of grammatical mechanism. As far as language studies are concerned, paying too much attention to the linear order will not help to explore the hierarchical nature of the language structure. After all, the growth and development of all living things, including languages, are based on structural dependence as their original driving force. Chomsky pointed out that the deep understanding of the principle of structural dependence can not be separated from the mentality of taking the initiative to solve the problem, but it also needs to be puzzled by the phenomenon of language that is not observed in any way.