过眼云烟

　　A flash in the pan.

　　Ephemeral grandeur.

　　eg：The public's enthusiasm to the plan turned out to be a flash in the pan.

　　中英俚语俗语来源：苏轼·宝绘堂记：“譬之烟云之过眼，百鸟之感耳。”

　　同义词：昙花一现 Sudden glory soon goes out