Group 1 - The article discusses the varying perceptions of rainfall despite identical measurements, emphasizing that the impact of rainfall is closely related to its intensity and duration [1][2] - It explains that a rainfall amount of 70 millimeters can have drastically different effects depending on whether it falls in a short period or is spread out over a longer duration, with urban drainage systems playing a critical role in managing excess water [1][3] - The article highlights that regional climate differences affect how rainfall is perceived, with the same amount of rain being considered extreme in one area but normal in another, illustrating the subjective nature of weather events [2][3] Group 2 - The article notes that geographical factors, such as soil type and urban infrastructure, significantly influence the consequences of rainfall, with areas prone to flooding or landslides being particularly vulnerable [3] - It mentions that global warming is expected to increase the frequency and intensity of extreme rainfall events, necessitating adaptive strategies for disaster prevention and mitigation [3]