Apr , 06 2021
March 22 is World Water Day. Today, 2.2 billion people in the world still do not have access to safe drinking water. The goal of the United Nations is to provide water and sanitation for all by 2030. Therefore, it is of great significance to deeply understand the value of water, care for and cherish water. In the past few decades, there have been many international discussions about "what is water...