This is my birthday trip. Jiulongtan is a natural oxygen bar with mountains and rivers. The temperature is comfortable. I climb the mountain in the morning and go down the mountain in the afternoon. I must bring some food and water. There are waterfalls and pools on the way. There are strange stones, birds, and people’s laughter. In addition to the hustle and bustle of the city, Breathing fresh air, refreshing, as if through time and space.