n.不可能(性);不可能的事(情况);
例句:
We soon saw the impossibility of reaching the city before midnight.
不多久我们便意识到半夜前抵达那个城市是不可能的.
She gently explained the impossibility of a marriage between us.
她有礼貌地解释了我们不能结婚的原因.
A single isolated force is therefore an impossibility.
所以单独的孤立的力是不存在的.