ephemeral(lasting for a short period of time) adjective [UK: ɪ.ˈfe.mə.rəl] [US: e.ˈfe.mə.rəl]
風靡一時的事物 noun
blockbuster [blockbusters](film or book, that sustains exceptional and widespread popularity and achieves enormous sales) noun [UK: ˈblɒk.bʌ.stə(r)] [US: ˈblɑːk.ˌbə.stər]