Aerial photo taken on Aug. 13, 2019 shows the fields of flowers at a modern agricultural science and technology demonstration park in Baiyin district of Baiyin city, northwest China's Gansu Province. The demonstration park plants the flowers to promote local tourism. (Xinhua/Fan Peishen)

　　Aerial photo taken on Aug. 13, 2019 shows the fields of flowers at a modern agricultural science and technology demonstration park in Baiyin district of Baiyin city, northwest China's Gansu Province. The demonstration park plants the flowers to promote local tourism. (Xinhua/Fan Peishen)

　　Aerial photo taken on Aug. 13, 2019 shows the fields of flowers at a modern agricultural science and technology demonstration park in Baiyin district of Baiyin city, northwest China's Gansu Province. The demonstration park plants the flowers to promote local tourism. (Xinhua/Fan Peishen)

　　Aerial photo taken on Aug. 13, 2019 shows the fields of flowers at a modern agricultural science and technology demonstration park in Baiyin district of Baiyin city, northwest China's Gansu Province. The demonstration park plants the flowers to promote local tourism. (Xinhua/Fan Peishen)

　　Aerial photo taken on Aug. 13, 2019 shows the fields of flowers at a modern agricultural science and technology demonstration park in Baiyin district of Baiyin city, northwest China's Gansu Province. The demonstration park plants the flowers to promote local tourism. (Xinhua/Fan Peishen)

　　Aerial photo taken on Aug. 13, 2019 shows the fields of flowers at a modern agricultural science and technology demonstration park in Baiyin district of Baiyin city, northwest China's Gansu Province. The demonstration park plants the flowers to promote local tourism. (Xinhua/Fan Peishen)

　　Photo taken on Aug. 13, 2019 shows the fields of flowers at a modern agricultural science and technology demonstration park in Baiyin district of Baiyin city, northwest China's Gansu Province. The demonstration park plants the flowers to promote local tourism. (Xinhua/Nie Jianjiang)

　　Aerial photo taken on Aug. 13, 2019 shows the fields of flowers at a modern agricultural science and technology demonstration park in Baiyin district of Baiyin city, northwest China's Gansu Province. The demonstration park plants the flowers to promote local tourism. (Xinhua/Fan Peishen)