What is the Phonetics' points of view?

What is the Phonetics' points of view?
【正确答案】：Phonetics looks at speech sounds from three distinct but related points of view.
First, it studies the sounds from the speaker’s point of view, i.e.，how a speaker uses his speech organs to articulate the sounds.
Then,it looks at the sounds from the hearer's point of view,i.e.，how the sounds are perceived by the hearer. Lastly, it studies the way sounds travel by looking at the sound waves, the physical means by which sounds are transmitted through the air from one person to another.These three branches of phonetics are labelled articulatory phonetics,auditory phonetics, and acoustic phonetics respectively.