英语繁荣富强怎么说呢

"Prosperous and strong" is a good way to translate "繁荣富强" into English. Here is an example sentence using this translation:
"Our country has become more prosperous and strong thanks to the hard work and dedication of its citizens."
Another way to say this in English would be:
"Our country has experienced great prosperity and strength due to the efforts and commitment of its citizens."
Both of these phrases convey the idea that a country is doing well economically and is strong politically or militarily.