Recently, the study tour group composed of about 50 college students from Singapore walked into Tianziling in Hangzhou, and launched the study tour with the theme of waste sorting.

The teachers and students learn about the story on how to transform a landfill into China's first waste dump ecological park. A student said: "This has experienced great changes in the past 30 years, which is surprising."

The students are amazed by the systematic full-chain waste disposal model of Hangzhou.