A lady shows a glass of green tea at the fourth China International Tea and Tea Ceremony Exhibition in Beijing, China, April 18, 2014. The four-day tea expo opened here Friday, attracting over 400 tea-related companies from home and abroad to show their products. (Xinhua/Wang Jingsheng)

A visitor views tea sets at the fourth China International Tea and Tea Ceremony Exhibition in Beijing, China, April 18, 2014. The four-day tea expo opened here Friday, attracting over 400 tea-related companies from home and abroad to show their products. (Xinhua/Chen Xiaogen)

Boxes of Liupu tea are displayed at the fourth China International Tea and Tea Ceremony Exhibition in Beijing, China, April 18, 2014. The four-day tea expo opened here Friday, attracting over 400 tea-related companies from home and abroad to show their products. (Xinhua/Ma Zhiyu)

Exhibitors shows new tea at the fourth China International Tea and Tea Ceremony Exhibition in Beijing, China, April 18, 2014. The four-day tea expo opened here Friday, attracting over 400 tea-related companies from home and abroad to show their products. (Xinhua/Chen Xiaogen)

Pu'er tea leaves shaped like gourds are displayed at the fourth China International Tea and Tea Ceremony Exhibition in Beijing, China, April 18, 2014. The four-day tea expo opened here Friday, attracting over 400 tea-related companies from home and abroad to show their products. (Xinhua/Wang Jingsheng)

Tea cakes are displayed at the fourth China International Tea and Tea Ceremony Exhibition in Beijing, China, April 18, 2014. The four-day tea expo opened here Friday, attracting over 400 tea-related companies from home and abroad to show their products. (Xinhua/Zhao Bing)

Japanese iron teapots are displayed at the fourth China International Tea and Tea Ceremony Exhibition in Beijing, China, April 18, 2014. The four-day tea expo opened here Friday, attracting over 400 tea-related companies from home and abroad to show their products. (Xinhua/Zhao Bing)

A teapot maker shows a teapot at the fourth China International Tea and Tea Ceremony Exhibition in Beijing, China, April 18, 2014. The four-day tea expo opened here Friday, attracting over 400 tea-related companies from home and abroad to show their products. (Xinhua/Chen Xiaogen)