Unobservability
不可观察性
🗣️ 情景例句
Please keep off the grass.
请勿践踏草地。
If we are bound to forgive an enemy,we are not bound to trust him.
即便我们决心宽恕敌人，也决不能相信敌人。
He usually drops in at my place on his way home.
他常常在回家的路上顺便来看看我。