Group 1 - The article discusses the historical significance of Yanhecheng Village, which was once a military stronghold during the Ming and Qing dynasties, highlighting its transformation from a city to a village over generations [2] - The village is located near the Yongding River, referred to as Beijing's mother river, and features a 200-year-old locust tree and an ancient opera stage from the Qing dynasty, symbolizing its rich cultural heritage [2] - The article reflects on the seasonal characteristics of rain in different regions, particularly in northern China, where summer rains are often sudden and intense, contrasting with the experiences of locals in arid areas who eagerly await rain [2] Group 2 - The article mentions the ancient Chinese custom of harvesting natural ice during winter, which was then used to cool off during the hot summer months, illustrating a historical connection between the cold of winter and the heat of summer [3] - It notes that the highest temperatures of the year occur during the "Zhongfu" phase, following the "Dazhu" solar term, with current temperatures reaching historical extremes, prompting reflections on how people historically described heat [3] - Modern expressions of dealing with summer heat are shared, including humorous comments from netizens about the extreme temperatures, indicating a cultural adaptation to climate challenges [3]