melt into thin air

例句：

1. 1.The snow has melted into thin air.
   雪已经化为乌有。
2. 2. His hopes for abetter future have disappeared into thin air.
   他对更好未来的希望已经消失得无影无踪。
3. 3. The story was just a dreamthat had melted into thin air.
   这个故事只是一个梦，现在已经消失得无影无踪了。