删除:把多余的词用斜线(\)划掉。
增加:在缺词处加一个漏字符号(/\),并在其下面写出该加的词。
修改:在错的词下划一横线,并在该词下面写出修改后的词。
I have just receive a letter from my brother, Tim. He is in Australia. He has been to there for six months. Tim is an engineer. He is work for a big firm and he has already visited a great number of different place in Australia. He has just bought an Australia car and has gone to Alice springs, a small town in centre of Australia. He will soon visits Darwin. From there, he will fly to Perth. His brother has never been abroad before, but he is finding this trip very excited.