Abstract Is not mentioned and the importance of the issue, however, is why this needs to be studied in this case? Abstract There are a number of words and the length that is too short. There is a compact, but not clear.
Abstract did not mention the history and importance of the issue. That is why studies are needed in this case abstracts. There are a number of words and the length is too short, concise, but still unclear.
Abstract, not to mention the background and significance of the problem. That is why there are studies in this case abstract the words and the length is too short, concise but is still unclear.