Visitors buy agricultural products during the 16th China-ASEAN Expo Agriculture Exhibition in Nanning, south China's Guangxi Zhuang Autonomous Region, on Sept. 22, 2019. The 16th China-ASEAN Expo Agriculture Exhibition kicked off in Nanning on Sunday. Various products including fishery products, high-quality fruits and tea attracted a lot of visitors.(Photo: Xinhua)

Visitors look at oysters during the 16th China-ASEAN Expo Agriculture Exhibition in Nanning, south China's Guangxi Zhuang Autonomous Region, on Sept. 22, 2019. The 16th China-ASEAN Expo Agriculture Exhibition kicked off in Nanning on Sunday. Various products including fishery products, high-quality fruits and tea attracted a lot of visitors. (Photo: Xinhua)

An exhibitor promotes jasmine tea during the 16th China-ASEAN Expo Agriculture Exhibition in Nanning, south China's Guangxi Zhuang Autonomous Region, on Sept. 22, 2019. The 16th China-ASEAN Expo Agriculture Exhibition kicked off in Nanning on Sunday. Various products including fishery products, high-quality fruits and tea attracted a lot of visitors. (Photo: Xinhua)

Visitors buy agricultural products during the 16th China-ASEAN Expo Agriculture Exhibition in Nanning, south China's Guangxi Zhuang Autonomous Region, on Sept. 22, 2019. The 16th China-ASEAN Expo Agriculture Exhibition kicked off in Nanning on Sunday. Various products including fishery products, high-quality fruits and tea attracted a lot of visitors. (Photo: Xinhua)

Visitors buy fruits during the 16th China-ASEAN Expo Agriculture Exhibition in Nanning, south China's Guangxi Zhuang Autonomous Region, on Sept. 22, 2019. The 16th China-ASEAN Expo Agriculture Exhibition kicked off in Nanning on Sunday. Various products including fishery products, high-quality fruits and tea attracted a lot of visitors. (Photo: Xinhua)

Vietnamese artists perform at the 16th China-ASEAN Expo at Nanning International Convention and Exhibition Center in Nanning, south China's Guangxi Zhuang Autonomous Region, Sept. 22, 2019. (Photo: Xinhua)

Philippine artists perform at the 16th China-ASEAN Expo at Nanning International Convention and Exhibition Center in Nanning, south China's Guangxi Zhuang Autonomous Region, Sept. 22, 2019. (Photo: Xinhua)

Philippine artists perform at the 16th China-ASEAN Expo at Nanning International Convention and Exhibition Center in Nanning, south China's Guangxi Zhuang Autonomous Region, Sept. 22, 2019. (Photo: Xinhua)

Lao artists perform at the 16th China-ASEAN Expo at Nanning International Convention and Exhibition Center in Nanning, south China's Guangxi Zhuang Autonomous Region, Sept. 22, 2019. (Photo: Xinhua)