I had known about the Great Wall since I was a child.我从小就知道万里长城

今天的几个句子是有关长城的：1. You are not a hero unless you climb on the Great Wall. 不到长城非好汉。2.You are a hero now. 你今天也成了好汉了。3. The Great Wall is indeed great. 长城确实了不起。