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11处起）不计分。
They are the sort of friend who are so close they trust each other with their lives. If one falls, the other is there catch him.
One is Wellman, his legs were permanently injured nine years before in a rock-climbing accident. The other is Corbett. He is a experienced rock climber. Together with, they climbed up Half Dome，the famous 2,000-foot rock in the Yosemite National Park.
However, their climb of Half Dome is not all smooth. At one point, pieces of rock gave way, but Corbett dropped down quickly. Wellman locked their rope in place, stopping the fall at 20 feet. Her quick action probably saved his friend life.
