I will forgive you just this once.

我会仅此一次原谅你。

You can borrow my car just this once.

你可以仅此一次借我的车。

Just this once, I will go to the party.

仅此一次，我会去参加聚会。

Just this once, I will make an exception.

仅此一次，我会破例。

Just this once, I will help you with your homework.

仅此一次，我会帮你做作业。

There was just this egg floating about in gallons of fat and raw bacon.

这只鸡蛋漂浮在大量的脂肪和生培根中。

I'm letting you stay up late, just this once.

我让你熬夜，就这一次。

With just this patience … you just watch and see.

只是这耐性…你只是观和看。

There's just this big list.

他们只有一个长长的清单。

Fine, but just this once.

好吧, 但下不为例.