Group 1 - The article highlights the dedication and perseverance of the author's grandfather and father in their respective professions, emphasizing their commitment to serving their communities [1][2] - The grandfather worked for nearly 30 years as a team leader in the bus transportation industry, witnessing its growth from inception to rapid development [1] - The father has been a rural school teacher for nearly 40 years, choosing to stay in a less favorable environment to provide quality education to local children [1][2] Group 2 - The comparison of the father's teaching philosophy to bamboo, which grows resiliently in harsh conditions, illustrates the importance of steadfastness in education [2] - The author expresses a commitment to environmental protection, inspired by the values of persistence and dedication demonstrated by the grandfather and father [2]