offadv.表示状态的关闭或离开prep.离开；在 ... 之外adj.空闲的；离开的；关闭的v.离开；脱下off keyadj.走音的(不合适的；不正常的)

1. These unreasonable rules should fall off.
   这些不合理的规章制度应该废止。
2. There is no sense in waiting three hours.
   等三个小时是不合理的。
3. You made a mistake in leaving her alone.
   你将她一个人留下是错误的。
4. You are wrong in laying the blame on him.
   你责备他是错误的。