I think the Rio Carnival would be the most exciting.

我认为里约狂欢节是最令人兴奋的。

Rio Carnival! I spent a really fun day there with my friends.

里约狂欢节！我和朋友们在那里度过了非常愉快的一天。

The Rio Carnival is a festival that is held before Lent every year and it is considered the biggest carnival in the world.

里约狂欢节是每年大斋期前举行的节日，被认为是世界上最大的狂欢节。