run against a wall的意思|示意

This is all very well, but the physicist comes along and shows that you never bump into anything: even when you run your head against a stone wall, you do not really touch it.

这当然不错。不过，一个物理学家会过来，他会向你展示，你永远也不会碰撞上任何东西，即使你用你的脑袋猛地撞上了一道石墙，你也不会真正地碰上它！

They approach rural affairs from an urban viewpoint and often run their heads against a brick wall because they draw up many inappropriate plans subjectively and enforce them arbitrarily .

他们带着城市观点去处理农村，主观地作出许多不适当的计划，强制施行，常常碰了壁。