[pào yǐng]
visionary hope, plan, scheme, etc.; bubble; naught; zilch
vanish like soap bubbles; melt into thin air; go up in smoke; come to nothing; end up in smoke
化為泡影
They were foiled in their attempt.
他們的企圖成了泡影。
Their prospects of success have vanished.
他們成功的希望已成為泡影。