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（∧），并在该词下面写出该加的词。
修改：在错的词下划一横线，在该词下面写出修改后的词。
注意：1．每处错误及修改均仅限一词。
2．只允许修改10处，多者（从11处起）不计分。
As we all know, over seventy percent of our planet are covered by sea, where is rich in salt as well as fish. What's more, there is a great deal of oil or gas under the sea. In other words, the sea is the place with so many important things we live in. However, with the world population increased rapidly, overfishing has become a serious problem. Every day a lot of rubbishes and waste water are poured into the sea, so the sea is bad polluted. As a result, the number of fish has obviously decreased. Besides, some are dying out or have been died out. Therefore, it is time for everybody protect the sea.
