Clean and hygienic. Official website, Shanghai Municipal Market Supervision Administration, introduced that the kitchen pool with food and beverage license should have more than three signs, namely, the hand-washing pool, the vegetable washing pool and the dish washing pool, so as to be clean and hygienic. Shanghai, referred to as "Shanghai" or "Shen" for short, is the largest economic center and an important international financial center city in China. It is one of the first coastal open cities. Shanghai is located in the east of China, at the mouth of the Yangtze River, facing the Pacific Ocean.