Photo taken on April 26, 2019 shows the China National Convention Center in Beijing, capital of China. The Second Belt and Road Forum for International Cooperation is held in Beijing from April 25 to 27. (Xinhua/Jin Liangkuai)

The "Golden Bridge on Silk Road" structure is seen outside the China National Convention Center in Beijing, capital of China, April 26, 2019. The Second Belt and Road Forum for International Cooperation is held in Beijing from April 25 to 27. (Xinhua/Jin Liangkuai)

Huang Kunming, a member of the Political Bureau of the Communist Party of China (CPC) Central Committee, also head of the Publicity Department of the CPC Central Committee, speaks at the Thematic Forum on Think-Tank Exchanges of the second Belt and Road Forum for International Cooperation (BRF) at the China National Convention Center in Beijing, capital of China, April 25, 2019. (Xinhua/Xie Huanchi)

Former Pakistani Prime Minister Shaukat Aziz speaks at the Thematic Forum on Think-Tank Exchanges of the second Belt and Road Forum for International Cooperation (BRF) at the China National Convention Center in Beijing, capital of China, April 25, 2019. (Xinhua/Xie Huanchi)

John Gordon Walter (C), president of the International Organization for Standardization, speaks at the Thematic Forum on Policy Connectivity of the Second Belt and Road Forum for International Cooperation (BRF) at the China National Convention Center in Beijing, capital of China, April 25, 2019. (Xinhua/Yin Gang)

The Thematic Forum on Clean Silk Road of the second Belt and Road Forum for International Cooperation (BRF) is held at the China National Convention Center in Beijing, capital of China, April 25, 2019. (Xinhua/Ju Huanzong)

The Thematic Forum on Financial Connectivity of the second Belt and Road Forum for International Cooperation (BRF) is held at the China National Convention Center in Beijing, capital of China, April 25, 2019. (Xinhua/Zhang Chenlin)

The Thematic Forum on Infrastructure Connectivity of the Second Belt and Road Forum for International Cooperation (BRF) is held at the China National Convention Center in Beijing, capital of China, April 25, 2019. (Xinhua/Yin Gang)

The Thematic Forum on Green Silk Road of the second Belt and Road Forum for International Cooperation (BRF) is held at the China National Convention Center in Beijing, capital of China, April 25, 2019. (Xinhua/Li He)

Photo taken on April 25, 2019 shows a signing ceremony of the Belt and Road CEO Conference at the China National Convention Center in Beijing, capital of China. (Xinhua/Chen Yehua)

The Thematic Forum on Economic and Trade Cooperation Zone Promotion of the Second Belt and Road Forum for International Cooperation is held at the China National Convention Center in Beijing, capital of China, April 25, 2019. (Xinhua/Ren Chao)

Miguel de Serpa Soares, the United Nations under-secretary-general for legal affairs, speaks at the Thematic Forum on Clean Silk Road of the Second Belt and Road Forum for International Cooperation at the China National Convention Center in Beijing, capital of China, April 25, 2019. (Xinhua/Ju Huanzong)

Guests take part in a cooperation documents exchange ceremony during the Thematic Forum on Digital Silk Road of the Second Belt and Road Forum for International Cooperation (BRF) at the China National Convention Center in Beijing, capital of China, April 25, 2019. (Xinhua/Cai Yang)

Henrietta Fore, the United Nations Children's Fund (UNICEF) executive director, speaks at the Thematic Forum on Trade Connectivity of the Second Belt and Road Forum for International Cooperation (BRF) at the China National Convention Center in Beijing, capital of China, April 25, 2019. (Xinhua/Zhang Chenlin)

The Thematic Forum on Sub-national Cooperation of the Second Belt and Road Forum for International Cooperation (BRF) is held at the China National Convention Center in Beijing, capital of China, April 25, 2019. (Xinhua/Ren Chao)