增加：在缺词处加一个漏词符号（^），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：每处错误及修改均仅限一词;
As we all know, walking is a good way of exercising and is beneficial of our health. It can not only reduce the risk of many kind of diseases but also builds up the bones. It's safe than many other ways of exercising, especially for the elderly and it's easy to do without consider rules. Beside, walking can also help us lose weight. What should we pay attention during the walk? First, we should wear loose clothes and good shoes so as that we can relax. Second, we should walk fast enough to cause us to breathe with difficult but still be able to talk. Third, it's huge important to walk with our arms moving freely. Most importantly, we should do it every day.
