According to Morrow (2014), he tells that “In the past, phonetics are the basic elements of language in education, especially in the research the language. So, the direct benefit of the phonetics is a tool of linguists.”
Another idea, by Deng (2015) explains “The language used in this world as long as they use speech. That means that language must have sound as a medium.” In addition, he also said “The point of the study of phonetics is cannot bring spelling in written language involved. Because that mean combines the background of the changing sound in the past involved.”