Tea growers pick up tea leaves in Weng'an County under Bouyei-Miao Autonomous Prefecture of Qiannan, southwest China's Guizhou Province, May 26, 2015. (Xinhua/Chen Haining)

Tea growers pick up tea leaves in Weng'an County under Bouyei-Miao Autonomous Prefecture of Qiannan, southwest China's Guizhou Province, May 26, 2015. (Xinhua/Chen Haining)

Tea growers pick up tea leaves in Weng'an County under Bouyei-Miao Autonomous Prefecture of Qiannan, southwest China's Guizhou Province, May 26, 2015. (Xinhua/Chen Haining)

Tea growers pick up tea leaves in Weng'an County under Bouyei-Miao Autonomous Prefecture of Qiannan, southwest China's Guizhou Province, May 26, 2015. (Xinhua/Chen Haining)

Tea growers pick up tea leaves in Weng'an County under Bouyei-Miao Autonomous Prefecture of Qiannan, southwest China's Guizhou Province, May 26, 2015. (Xinhua/Chen Haining)