[误] The good days were only the display of broad-leaved epiphyllum.

[正] The good days were only a nine days\' wonder.

注：“昙花一现”在中文里是个成语，它在英文中的表达也是约定俗成的。你可以用 a nine days\' wonder，也可以用 a flash in the pan，你甚至可以说 last briefly。但象上面的那样的直译却是典型的中式英语，会贻笑大方的。

参考例句：That singer can't last. He's a flash in the pan 那歌手不能持久,他只是昙花一现