Students use waste materials to make ornaments during a class at a school in Lincheng Township in Changxing County, east China's Zhejiang Province, July 10, 2018. Volunteers from Hangzhou Normal University and government officials organized the class to teach students how to classify the garbage and reuse the waste. (Xinhua/Xu Yu)

Students use waste materials to make ornaments under the guidance of volunteers during a class at a school in Lincheng Township in Changxing County, east China's Zhejiang Province, July 10, 2018. Volunteers from Hangzhou Normal University and government officials organized the class to teach students how to classify the garbage and reuse the waste. (Xinhua/Xu Yu)

Students use waste materials to make ornaments under the guidance of volunteers during a class at a school in Lincheng Township in Changxing County, east China's Zhejiang Province, July 10, 2018. Volunteers from Hangzhou Normal University and government officials organized the class to teach students how to classify the garbage and reuse the waste. (Xinhua/Xu Yu)

Students use waste materials to make ornaments under the guidance of volunteers during a class at a school in Lincheng Township in Changxing County, east China's Zhejiang Province, July 10, 2018. Volunteers from Hangzhou Normal University and government officials organized the class to teach students how to classify the garbage and reuse the waste. (Xinhua/Xu Yu)

Students present the ornaments they made from waste materials during a class at a school in Lincheng Township in Changxing County, east China's Zhejiang Province, July 10, 2018. Volunteers from Hangzhou Normal University and government officials organized the class to teach students how to classify the garbage and reuse the waste. (Xinhua/Xu Yu)

Students use waste materials to make ornaments under the guidance of volunteers during a class at a school in Lincheng Township in Changxing County, east China's Zhejiang Province, July 10, 2018. Volunteers from Hangzhou Normal University and government officials organized the class to teach students how to classify the garbage and reuse the waste. (Xinhua/Xu Yu)

Students put on their paintings about their hometown during a class at a school in Lincheng Township in Changxing County, east China's Zhejiang Province, July 10, 2018. Volunteers from Hangzhou Normal University and government officials organized the class to teach students how to classify the garbage and reuse the waste. (Xinhua/Xu Yu)