Tourists visit a tropical fruits greenhouse in Wanchang Township of Yongji County, Jilin City, northeast China's Jilin Province, Aug. 12, 2020. Yongji County has encouraged local farmers to grow tropical fruits such as papayas and bananas in the pursuit of agricultural structure optimization. (Xinhua/Xu Chang)

Tourists visit a tropical fruits greenhouse in Wanchang Township of Yongji County, Jilin City, northeast China's Jilin Province, Aug. 12, 2020. Yongji County has encouraged local farmers to grow tropical fruits such as papayas and bananas in the pursuit of agricultural structure optimization. (Xinhua/Xu Chang)

Tourists visit a tropical fruits greenhouse in Wanchang Township of Yongji County, Jilin City, northeast China's Jilin Province, Aug. 12, 2020. Yongji County has encouraged local farmers to grow tropical fruits such as papayas and bananas in the pursuit of agricultural structure optimization. (Xinhua/Xu Chang)

An employee tends papaya trees in a tropical fruits greenhouse in Wanchang Township of Yongji County, Jilin City, northeast China's Jilin Province, Aug. 12, 2020. Yongji County has encouraged local farmers to grow tropical fruits such as papayas and bananas in the pursuit of agricultural structure optimization. (Xinhua/Xu Chang)

An employee tends papaya tree in a tropical fruits greenhouse in Wanchang Township of Yongji County, Jilin City, northeast China's Jilin Province, Aug. 12, 2020. Yongji County has encouraged local farmers to grow tropical fruits such as papayas and bananas in the pursuit of agricultural structure optimization. (Xinhua/Xu Chang)