That’s true. If you know English and Romanian, you can pretty much learn how to speak any language in Europe.
(Just asking) How will knowledge of English and Romanian (a Romance language like Spanish, French, or Italian) assist in learning Slavic languages like Czech, Polish, or Serbo-Croatian?
BTW, I was deployed to Uzbekistan 2003-04 and found that recalling my high school Latin greatly assisted my learning Russian. Similar grammatical logic, so maybe you’re right.