假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌的以下作文。文中共有10处语言错误，每句中最多有两处。错误涉及一个单词的增加、删除或修改。
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，并在其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。
I was always afraid of water because I nearly get drowned when I was young. As I grew old, this fear was still with me. However, my attitude to water changed last summer. One day, several classmates asked me lean to swim with them, and of course, I said no. But they were quite determined and repeated explained the benefits of swimming for me. So finally I agreed to give them a try. You can imagine what scared I was when I first had stepped into the swimming pool. But gradually, I found it great funs in the water. Now I'm no longer a gird live in fear of water.
是定义在
上的偶函数，
为奇函数，
，当
时，
，则在
内满足方程
的实数
为