摘要
Aleisurely stroll around Yundang Lake in Xiamen,located in Fujian Province Lin southeast China,unfurls a landscape where waves undulate gently and egrets gracefully glide across the water.Amid the stream of people enjoying the lakeside,one man stands out for his continuous observation of the lake's ecosystem.He is Chen Yajin,a 65-year-old retiree.Formerly a teacher at a local middle school,he is now serving his community as a"citizen lake guardian."
