复习资料（4.14）
17、Theory of universal grammar普遍语法理论
Since early 1980s Noam Chomsky developed a theory of universal grammar (UG) know as the principle-an-parameters theory. UG is a system of linguistic knowledge and a human species-specific gift which exists in the mind or brain of a normal human being. UG consists of a set of general conditions, or general principles and also contains a set of parameters.
从八十年代初期开始，乔姆斯基发展了一种普遍语法理论，称为原则与参数理论。普遍语法是一个语言知识体系，是人类特有的天赋，它存在于正常人的头脑中。普遍语法包含一组广义条件，或广义原则，还包含一种参数。