Visitors view light installations at the preview of the Singapore Night Festival held in Singapore on Aug. 21, 2019. (Xinhua/Deng Zhiwei)

Photo taken on Aug. 21, 2019 shows the scene of a press conference held by Hong Kong police in south China's Hong Kong. Hong Kong police on Wednesday called on all journalists to respect each other's freedom of news coverage after a female reporter from the mainland was surrounded by her Hong Kong peers questioning her identity after a press conference on Tuesday. (Xinhua/Mao Siqian)

Photo taken on Aug. 20, 2019 shows the scenery of Gold Buddha Mountain in southwest China's Chongqing. (Xinhua/Liu Chan)

People takes photos as the D6622 train enters the Caofeidian East Railway Station in Tangshan City, north China's Hebei Province, Aug. 21, 2019. (Xinhua/Yang Shiyao)

A doll is seen amid flowers at Auburn Botanic Gardens during the Sydney Cherry Blossom Festival in Sydney, Australia, Aug. 21, 2019. (Xinhua/Bai Xuefei)

Photo taken on Aug. 19, 2019 shows the construction site of the Vientiane to Vangvieng section of China-Laos expressway in Laos. (Photo by Liu Ailun/Xinhua)

Photo taken on Aug. 21, 2019 shows the scene after heavy downpours in Gengda Town of Wolong special administrative region in Wenchuan County, Aba Tibetan and Qiang Autonomous Prefecture, southwest China's Sichuan Province. (Xinhua/Xue Yubin)

Philippine Department of Health Secretary Francisco Duque III (C, standing) talks to a leptospirosis patient in a leptospirosis ward transformed from a covered basketball court in the National Kidney and Transplant Institute (NKTI) in Quezon City, the Philippines, Aug. 20, 2019. (Xinhua/Rouelle Umali)

Aerial photo taken on Aug. 20, 2019 shows a farmer drying hybrid rice seeds at Zhouping Village in Zhuxi Town of Cengong County, southwest China's Guizhou Province. (Xinhua/Yang Wenbin)