方兴未艾 | fāng xīng wèi aì
Xi Jinping used this chengyu in a speech given at the 2019 BRICS summit in Brazil on November 14, 2019.
Meaning
Up and coming; to be unfolding/ growing/ ascending
Original
环顾全球，新科技革命和产业变革方兴未艾，为各国实现跨越式发展提供更多机遇。
Source
http://cpc.people.com.cn/n1/2019/1115/c64094-31456340.html