⁌ ULY ⁍added a comment 7 years ago
Olga, MAIN is used with things that have a hierarchy. Here, by analogy with the Seven Wonders of the World, the preposition OF sounds better than IN.
Ты — главное чудо во вселенной!
You're the greatest wonder of the universe.
You are the main wonder in the Universe!
Olga, MAIN is used with things that have a hierarchy. Here, by analogy with the Seven Wonders of the World, the preposition OF sounds better than IN.