Supplement: Tea can be divided into flat tea and long tea according to the shape of tea. When identifying the quality of flat tea with strips, we mainly observe the flatness and smoothness of tea; The strip tea mainly observes the elasticity, thinness, roundness, lightness and straightness of the tea. Under normal circumstances, the raw materials of tea are tender, the tea-making technology is good and the quality is high, so the tea strips are tight, heavy, even and straight; The raw materials of tea are old, the tea-making technology is poor and the quality of tea is poor, so the tea strips are loose, small and flat.