The words that express time appear many times in the text of the mountain city. What role do they play in the text?

The mountain city was a famous modern urban novel. The words that appeared many times in the text to indicate time had the following specific functions: Words that represented time could be used to describe the historical background and the process of change of Mountain City. For example," About ten years ago, Mountain City suddenly became very lively." The phrase "about ten years ago" in this sentence meant that the passage of time paved the way for the development of the following plot. The word '2' could also be used to describe the development of Shan City. For example," From that day ten years ago, Mountain City gradually became prosperous." The "that day" in this sentence means that the passage of time foreshadows the development of the following plot. Words that represented time could also be used to highlight the characteristics and characteristics of the mountain city. For example," The emergence of Mountain City has brought a new life to the city." A new life in this sentence means that the passage of time foreshadows the development of the following plot. To sum up, the words used to express time played a very important role in the story of the mountain city. Not only did they pave the way for the development of the plot, but they also highlighted the characteristics and characteristics of the mountain city.