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。
It is well known that one of the aims of UNESCO is to protect and preserve culture and natural heritage. Our heritage is the precious gift from the past, and it is also what we live with today. I believed some of you may have visited Mount Tai and Mount Huang, or have been to Jiuzhaigou. Many people just find unbelievable that so beautiful places exist in this world.
These heritage site impress visitors with their amazed beauty, and they are a great source of inspiration. There are altogether more than over 900 World Heritage sites. People have come to understanding the truth that they do not belong to any single person, and to all mankind.
