假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。文中共 有 10 处语言错误，每句中最多有两处。每处错误仅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。
Li Bai, a famous poet in the Tang Period, liked playing and afraid of difficulties in his childhood. However, he fell behind others in his studies.
One morning, on his way home after school, he walked by a stream, that he saw an old woman grind (v. 磨 ) a very thick iron rod ( 棒 ). He went to her and curious asked why she was doing so. The old woman replied, “To make a needle.” Li Bai felt more curious on the answer,
“How can you grind such a thick iron rod into a needle?” “If one work with constant effort, he can make this,” she answered. Hearing her word, Li Bai was inspired. After that, Li Bai studied hard and made a rapid progress.
