增加：在缺词处加一个漏字符号（∧）,并在其下面写出该加的词。
删除：把多余的词用斜线（\）划掉。
修改：在错的词下划一横线，并在该词下面写出修改后的词。
注意：1．每处错误及其修改均仅限一词；
2．只允许修改10处，多者（从第1!处起）不计分。
Online learning provides a excellent choice for us students who are unable to attend classes during regularly hours. It meets your needs with a teacher on the scheduled time. Connecting the Internet, we can take online courses on equipments such as mobile phones. It is also of great use to those whom would like to take additional lessons. The distance education offer a platform of communication to both teachers and students participated in courses. Even if we don't have time to sit at a desk, and we can learn conveniently. When we had a problem, we can easily work it with the help of the teachers online.
