这四期节目，都得出门走走才能体会｜Knock Knock 世界

Group 1 - The article discusses the influence of the Michelin Guide, which is considered the most authoritative food recommendation list globally, and its origins linked to a tire company [9][7]. - The Michelin Guide was first published in 1900 to promote tire sales in France, where there were fewer than 3,000 cars at the time [9]. - The guide's evaluators are trained professionals who dine anonymously at restaurants worldwide to maintain objectivity and avoid detection [9]. Group 2 - Zhangjiajie National Forest Park attracts a significant number of South Korean tourists, with many believing that taking parents there is a sign of filial piety [6]. - The number of flights between Zhangjiajie and major South Korean cities has reached 30 per week, making travel time shorter than driving across South Korea [8]. - The article highlights the growing trend of foreign tourists visiting various Chinese cities, indicating a potential increase in tourism revenue [8][12]. Group 3 - The article addresses the issue of pollen allergies, particularly in spring, and clarifies that the real culprit is pollen from trees like willows and cypresses, rather than the visible fluff [13]. - Approximately 200 million people in China suffer from pollen allergies, which translates to one in every seven individuals [13]. - The historical context of tree planting in urban areas is discussed, noting that fast-growing species were planted post-World War II for construction purposes, leading to current allergy issues [13].