With more than 20,000 plants, the Expo Botanic Garden is not only popular with tourists from all over the world but also serves as a specialized science class for students. The expo team put a lot of effort into building a vibrant and attractive environment that includes plant conservation and technology application. Greenhouse Manager Wang Yuan recommends two must-sees in the Botanic Garden. One is the mangrove; another is the plant science paintings collected by Kew Gardens. He Xi, a staff member who is in charge of plant conservation and exhibition planning, encouraged people to work together in protecting the environment.