Of course I can ask. And a fat lot of good that'll do!

当然可以去要。但那有个屁用！

And a fat lot of good it's brought her, judging by the state of things.

从事情的状态来看，它给她带来了很多好处。

A fat lot of good it's brought this family, with people banging on the door and all the neighbours thinking we've been done for benefit fraud or some such.

它给这个家庭带来了很多好处，人们敲门， 所有的邻居都认为我们是因为福利欺诈或类似的事情而做的。

" A Hogsmeade branch, you know, but a fat lot of good it'll do us if you lot aren't allowed out at weekends to buy our stuff anymore...But never mind that now."

“搞个霍格莫德分店，你懂的，但它只会让我们积压过量的存货，如果你们周末都不能过去买我们的东西的话......不过现在不说它了。”