Apple CEO Tim Cook delivers a speech at the opening ceremony of the China Development Forum (CDF) 2018 at the Diaoyutai State Guesthouse in Beijing, capital of China, March 25, 2018. (Xinhua/Li Xin)

Participants listen to guest speakers at the China Development Forum (CDF) 2018 at the Diaoyutai State Guesthouse in Beijing, capital of China, March 25, 2018. The CDF 2018 was opened here on Sunday.(Xinhua/Chen Yehua)

The China Development Forum (CDF) 2018 is opened at the Diaoyutai State Guesthouse in Beijing, capital of China, March 25, 2018. (Xinhua/Li Xin)

President of Asian Development Bank (ADB) Takehiko Nakao speaks at the opening ceremony of the China Development Forum (CDF) 2018 at the Diaoyutai State Guesthouse in Beijing, capital of China, March 25, 2018.(Xinhua/Li Xin)

Participants listen to guest speakers at the China Development Forum (CDF) 2018 in Beijing, capital of China, March 25, 2018. The CDF 2018 was opened here on Sunday.(Xinhua/Li Xin)

Guests speak at the China Development Forum (CDF) 2018 in Beijing, capital of China, March 25, 2018. The CDF 2018 was opened here on Sunday.(Xinhua/Chen Yehua)（本文来源：新华网）