I. Introduction
With the expansion in economic development cooperation, countries need to use a common global language to communicate and work. English has officially become the most popular language worldwide [1] . Without a good foundation of English, it will be difficult for future generations to keep up with new trends in the world, the development of technology, and job opportunities. English helps the people who live in other countries communicate and make the transaction; therefore, learning English, particularly in countries that use English as the second language, is very important. Among many English skills, pronunciation is one of the most critical factors because the listener must receive the content and recognize the pronunciation of the words from the speaker to communicate efficiently and convey the message [2] . Pronunciation is an essential but often overlooked factor in second language acquisition, both in teaching and research [3] ). It is one of the most challenging skills in language training. [4]