This question explores the reasons why people participate in activities. When answering, you can analyze from various perspectives such as social interaction, personal interests, health and fitness, learning and development, as well as seeking entertainment and relaxation. You can emphasize that people participate in activities to meet social needs, pursue personal interests, maintain health, acquire new knowledge or skills, and as a way to escape from daily stress and busyness.

这个问题探讨了人们参加活动的原因。在回答时，你可以从社交互动、个人兴趣、健康和健身、学习和发展、以及寻求娱乐和放松等多个角度来分析。你可以强调人们通过参加活动来满足社交需求、追求个人兴趣、保持健康、获得新知识或技能，以及作为一种逃避日常压力和忙碌的方式。