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l0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l0处，多者(从第11处起)不计分。
As a boy grown up in India，I had longed to traveling abroad. I used to listen to the stories my father told me about her stay in Canada and trips to Europe in1970s. My big moment finally come in the summer of 1998 when I was able to accompany my parents to Europe, where my father was to attend for a meeting. The service during the flight to Frankfurt was such nice that even today I can still remember them. The flight was really smooth and thorough enjoyable，even someone as me, who is otherwise scared of flying.
的曲率k=______．