The historical study of language also enables us to determine how non-linguistic factors, such as social, cultural and psychological factors, interact over time to trigger linguistic change.
历史语言学的研究还可以使我们对非语言的因素，如社会文化和心理因素等在语言变化过程中所起的作用有更深的认识。
Finally, we will demonstrate how psychological knowledge can be used to understand and change cultural forces at work in our lives.
最后，我们将证明心理学知识如何能够被用来理解并改变我们生活中现行的文化力量。
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