Dear sir, <br />There are several (**) in the paper. <br />It means either some equations or some symbols. <br />While reverting to the word, there were so many error. <br />But anyway I expect that you would not interested in equations. <br />Just treat them as equations or symbols. <br />My concern is expressions and grammar. <br />I want concise expression, but I also want that the paper looks too simple such as written by a student. <br />If you have any question, please let me know it.<br />Thank you very much.<br /><br />