We need to settle this once and for all.
我们需要把这事一次解决。
Oh, please, Dad, just this once don't be cheap.
哦，求求你，爸爸，就这一次，别小气嘛。
Can't you be nice to each other just this once?
难道你们就不能彼此客气哪怕一次？
M: Well, just this once, come on!
玛：好的，就这一次，来吧！
You usually only have to do this once.
您通常只需这样做一次。
我只能帮你这一次。
I'll forgive you for this once.
我只原谅你这一次。
Just this once. Don't be so mean.
就着一次啦，别这么凶嘛！
Please just let me win this once.
就请您让我赢一次吧！
I hope you'll forgive me this once.
我希望你就原谅我这一次。
Please. Refill it for me just this once.
但是我还需要，拜托，帮我加满这次就好。
Just this once. I'll never ask again.
就这么一次。我不会再这样要求了。
We knew this once, but now we've forgotten.
以前我们知道这些，但是现在我们忘了。
但是，仅仅这一次。
好吧，就这一次！
I'm going to handle this once and for all.
我这就去一次性彻底解决这个问题。
Why can't we use the power just this once?
这力量用一次也不行吗？
I'll say this once. I never said it before.
我只想声明一次，我以前从来没有这样说过。
Just this once can it borrow your hair drier?
只这一次，我能借你的电吹风用吗？
It achieves better effect to repeat this once.
重复一次效果更佳。
Can't you help your good friend? Just this once.
难道你不应当帮助你的好朋友啦？就只这一次呀。
You shouldn't lose this once in the blue moon chance.
你不该错过这个难得的机会。
Can you just let it slide, officer, just this once?
长官，这次就放我一马行么？
ROBERT: I'll say this once. I never said it before.
罗伯特：我只想声明一次，我以前从来没有这样说过。
It is hard to imagine that this once was a busy city.
很难想像，这曾经是一个繁忙的城市。
My whole family did this once, and it was very enlightening.
我的全家曾试过一次，的确很有启发。
My whole family did this once, and it was very enlightening.
我的全家曾试过一次，的确很有启发。
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