众所周知，长城是世界奇观之一，每年吸引了海内外数以百万计的游客，但是很多人在游览长城时却不能保护好环境，请对此问题，向游

Dear tourists,

It’s known to us all that the Great Wall is one of the greatest wonders in the world and attracts millions of people home and abroad. However, some tourists don’t care about the environment during their visit to the Great Wall. Some of them throw waste here and there and some even carve in the bricks. These make the Great Wall dirty and less attractive.

Therefore, I sincerely hope that all the tourists protect the scenic spot. And whenever we find tourists who have some bad behavior on the Great Wall, we should stop them and tell them not to do that any more. Only by doing this can we provide clean surroundings for other tourists.