你從哪裏看到Transylvania是二戰後加入的？據我所知，是一戰後從奧匈帝國割的

根據AI：Transylvania became part of Romania in stages, with the key moment being the declaration of union on December 1, 1918, after World War I, formally ratified by the Treaty of Trianon in 1920, which officially transferred the region from Hungary to Romania, though parts were temporarily returned to Hungary during WWII before becoming definitively Romanian post-war