Why did you lie? You've got nothing on. Not a single case. That's why the wall took a pounding.

你这是何必？你根本无事可做。一宗案子也没有，所以墙才遭罪。

Boy, that guy's really taking a pounding in this conversation.

那家伙真是让这番对话意味深长啊。

The idea is that when you run, the flexible, tough tissue that cushions your knee joints, called cartilage, takes a pounding.

这个想法是， 当你跑步时，缓冲膝关节的柔韧、坚韧的组织（称为软骨）会受到冲击。