I'm not your punching bag.

我不是你的出气筒。

I'm not going go be a punching bag for anyone.

我不会给任何人当替罪羊。

Mr. norton's head jerked like a jabbed punching bag .

诺顿先生的头象戳破了的拳击吊袋一样陡然一动。

He makes his living as a punching bag for drunken businessmen.

他靠充当那些醉鬼商人的出气筒来谋生。

Thus, when you hit a punching bag, it bounces right back at you.

因此，当你击吊袋时，它就朝着你弹回来。