In the last fifty years or so, more and more researchers have studied knowledge and use of language as a cognitive phenomenon, the main problems being how knowledge of language can be acquired and used, and what precisely it consists of.
最近50年来，越来越多的研究者将语言的学习和使用看作一种认知现象，关注的主要问题是语言是如何被习得和使用，以及它具体是如何构成的。