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。作文中共有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：在缺词处加一个漏词符号(∧)，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：在错的词下画一横线，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。

    As we all know, culture is similar with an iceberg (冰山). There are cultural roles where are obvious and easily to understand. Most of our cultural values, however, is not clear or hidden. For example, when you will visit a restaurant in Japan, people may sit on the floor and use chopstick to eat. These eat habits are easy to come across. You may not know, therefore, that it's common for a man to sit cross-legged on the floor, but it's not considered acceptable for woman to do so. You have to study people's body language to understanding this less obvious cultural rule.