Nilpotency
幂零性
🗣️ 情景例句
there isn't any work for a retired person my age.
没有我这种年纪的退休老人的工作。
When did you get off work?
你什么时候下班？
We've got to think of ways of changing people's habits.
我们得想想办法，改变人们的习惯。