1. Big deal!

没什么大不了!

2. What of it?

那又怎样?(跟我有神马关系!)

3. That's not saying much.

这也说明不了什么嘛。

4. It doesn't make any difference to me.

对我来说没什么区别啊。

5. It's all the same to me.

对我来说都一样。

6. It's no skin off my nose.

那可不关我的事。

7. It's none of my business.

不关我的事!

8. They can all starve for all I care.

他们就是都饿死也跟我没半毛钱关系。