Yogurt is a snack you can find on every street corner. With its sweet and sour taste, yogurt makes a nutritious summer drink. Usually yogurt you see in Xining is filled in small bowls, which are stacked with a piece of glass on each storey. You can require some sugar on yogurt to your own taste.  It costs only RMB1.2 yuan for a little bowl , why not having a taste of it?