Aerial photo shows farmers picking tea leaves at a tea garden of an agricultural company in Laoshan district of Qingdao, East China's Shandong province, May 19, 2018. [Photo/Xinhua]

A farmer shows the fresh tea leaves at a tea garden of an agricultural company in Laoshan district of Qingdao, East China's Shandong province, May 19, 2018. [Photo/Xinhua]