At the moment, I smiled. There are many unforgettable memories in my childhood. Last summer, I remember I smiled happily when I was standing at the top of the Great Wall. The wind was blowing, and it was very cold. I was very proud because I was at the top of the historic building. Climbing to the top was not an easy thing. The Great Wall was about six thousand kilometers, and I only climbed a small part of if it. But at that moment, I smiled to everyone.