Phonetics: studies speech sounds, including the production of speech, that is how speech sounds are actually made, transmitted and received, the sounds of speech, the description and classification of speech sounds, words and connected speech, etc.

• 语音学：研究语音，包括言语的产生（就是言语在现实中怎样形成、递和接受）言语的声音，语音的描写和分类，词语和话语连接，等等。