希望但不可能实现的事 impossible dream
比喻不可能实现的事 try to fish out the moon from bottom of the sea strive for the impossible or the illusionary
让我来设想一下这个不可能实现的事吧：如果我们跳过人口增长的规律让每一个同代人都有两个孩子会怎样？
Impossible to pull off, but worth considering: what if we skipped a growth cycle in the population and everyone in a generation had just two kids?
举个例子，有些不可能在现实生活中发生的事，往往能在电脑游戏中实现。
For example, something impossible in your real life can be realized in the computer games.
最终，柏拉图意识到自己不可能过那种退隐的精神生活；他觉得必须为实现社会的理性公正做一份自己的事。
In the end Plato could not see himself living a private life of the mind; he felt that he had to make his contribution to the construction of a rational and just society.
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