n.不可能之事；不可能

It was set down as an impossibility. 那被看作是不可能的事。

It is an impossibility for you to do so. 你那樣做是不可能的事。

It is a physical impossibility to be in two places at once. 同時身處兩地在自然法則上是不可能的。

Completely banning nuclear weapons is a virtual impossibility. 完全禁止核武器實際上是不可能的。