pipe dream

英 [ˈpaɪp driːm]

美 [ˈpaɪp driːm]

n. 脱离实际的愿望; 行不通的计划; 妄想

牛津词典

noun

N-COUNT 白日梦；不切实际的空想
Apipe dreamis a hope or plan that you have which you know will never really happen.
1. You could waste your whole life on a pipe-dream.
  白日梦会荒废你一生。

noun

a fantastic but vain hope (from fantasies induced by the opium pipe)
1. I have this pipe dream about being emperor of the universe
Synonym:dream

Saying that you want something different without thinking and acting differently ensures that you continue to have your pipe dream.
你总是在念叨想要不同的生活，却不想也不做不同的事，这会保证你永远做的是白日梦。
Alternative fuel for vehicles, once a pipe dream, has become a reality.
汽车代用燃料，曾经是一个可望不可及的梦，可现在却日行日近。
It's only a pipe dream, but I wish I could meet him.
那不过是个空想，但我真希望能见到他。
You can study acting as long as you like, but starring in a Hollywood movie is just a pipe dream.
只要你喜欢你就可以去学表演，但是主演一部好莱坞电影只是白日梦。
He would love to have a beautiful mansion, but that is a pipe dream.
他很想有栋豪宅，但只是一种空想。
On the face of it, the idea of a pan-Asean exchange looks like a pipe dream.
乍看起来，泛东盟交易所似乎是个白日梦。
Otherwise, the drive for the four modernizations will become a pipe dream.
否则，搞四个现代化就会变成一句空话。
The trouble with your pipe dream is that it would cost you$ 10,000.
你空想的问题是，那要花你一万元钱。
As national reform efforts stall, international harmonisation remains a pipe dream.
随着每个国家的改革努力陷入停滞，国际协同仍然是一个白日梦。
You had to put it all on the line for some Vegas pipe dream.
你为了圆拉斯维加斯的梦，把什么都压上了。