同学们在研究灭火的原理时，进行了如下实验：分别在两个小铁盒中倒入少量植物油并点燃，一位用坩埚钳把小铁盒放在冰水共存的水面上，观察到火焰立即熄灭，该实验采用的灭火的原理是____ ，另一位同学将一块湿抹布盖在小铁盒上，火焰也立即熄灭，他依据的灭火原理是____ 。

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短文。短文中共有10处错误，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（∧），并在此符号下面写出该加的词。

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。

    Last year,I went shopping in a department store.Little do I know that I was heading for a very new experience. While I was walking around the store,I happened to see the foreigner trying to explain herself with a salesman. Gathering her courage,I decided to step in and helped her explain herself.Fortunately,I could understand that she was talking about,so I just translated it into Chinese.

    I felt glad for able to help her and talk with her.She said that she was a student like me and was touring China lonely.She told me about some experience she had touring the country.Although I won't see her again,but it's good to meet someone like her from another country.