请翻译以下句子: Black tea can be drunk alone, and also can be mixed with milk, cubic sugar, spices, fruit juice or alcohol, to be served as appetizing romantic beverage. Chinese tea can be classified in different ways. Based on the degree of fermentation of the tea, Chinese teas can be roughly classified into six species. 3. According to the different shapes, Pu-erh tea can be divided into two groups as loose-leaf Pu-er and compressed pu-er.