为了达到这一目的，古老的语音学理论知识是非常必要的。
It is necessarytohiaenknowledge of phonetics theory in order to achieve the purpose.
第三，本文结合语音学和历史音韵学理论，讨论了导致语音变化和内部差异产生的原因。
Utilizing the theory of phonetics and historical phonology, the thesis discusses the cause of the sound changes and the diversities.
教授过对外汉语的所有语言技能型课程，为研究生开设过汉语语音学、汉字教学研究、现代语言学理论等课程。
She has taught all types of Chinese language skill courses to international students, as well as teaching graduate level Chinese Phonetics, Chinese Philology, and Modern Linguistics Theories, etc.
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