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：在错的词下画一横线，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。
When it come to the ocean, its pollution is becoming more and more serious. World Ocean Day, fall on June 8th, is aimed at raising aware of preserving the ocean.
The ocean plays a key role in our world. Not only does ocean offered us sufficient food, and it maintains the balance of nature. Thus, it is crucial for us preserve the ocean. First of all, place importance in our daily actions. For example, garbage can't be thrown into the ocean.
What's the more, we can also hand out booklets to call on more people to preserve the ocean. The more people are involved, the good the ocean environment is.
All in all, it is high time that we devoted ourselves to preserving the ocean. To preserve the ocean is to protect ourself.
