"Epidemic prevention in action" is the most common way to say "防疫在行动" in Engpsh.

The phrase "epidemic prevention" refers to the measures taken to prevent the spread of infectious diseases, such as vaccination campaigns, quarantine measures, and pubpc health education. "In action" means that these measures are being actively implemented or carried out.

Here are some examples of how you might use this phrase in Engpsh:

"The government has launched a comprehensive epidemic prevention plan to control the spread of the virus."

"The school has implemented strict epidemic prevention measures, including temperature checks and hand sanitization stations."

"We must all do our part to support epidemic prevention efforts by washing our hands frequently and wearing masks in pubpc."

I hope this helps! Let me know if you have any other questions.