Tourists pick strawberries at a greenhouse in Jimo District of Qingdao, east China's Shandong Province, on Dec. 9, 2018. Strawberry stereoscopic cultivation is a new cultivation method which can raise land use efficiency and make sure that tourists pick strawberries more easily. (Xinhua/Liang Xiaopeng)

　　A farmer takes care of strawberries at a greenhouse in Jimo District of Qingdao, east China's Shandong Province, on Dec. 9, 2018. Strawberry stereoscopic cultivation is a new cultivation method which can raise land use efficiency and make sure that tourists pick strawberries more easily. (Xinhua/Liang Xiaopeng)

　　Tourists pick strawberries at a greenhouse in Jimo District of Qingdao, east China's Shandong Province, on Dec. 9, 2018. Strawberry stereoscopic cultivation is a new cultivation method which can raise land use efficiency and make sure that tourists pick strawberries more easily. (Xinhua/Liang Xiaopeng)

　　Children display strawberries picked by themselves at a greenhouse in Jimo District of Qingdao, east China's Shandong Province, on Dec. 9, 2018. Strawberry stereoscopic cultivation is a new cultivation method which can raise land use efficiency and make sure that tourists pick strawberries more easily. (Xinhua/Liang Xiaopeng)