not to be taken as a precedent 或者not to be repeated 或者 wont do it again
It won‘t happen again
Just this once
Not to be repeated
其实要看语境再用不同的表达，并不是一种表达可以用在所有的句子和语境中。有的自己说下不为例，有的是被要求下不为例。
I promise/hope that it won’t happen again。
随便你
as you like
It‘s up to you
whatever you say
at your disposal
下不为例
just this once
not to be taken as a precedent
not to be made a precedent
not to be repeated
Just this once。
就此一回，下不为例。
Today is a special case。 I won’t do it again。
今天特殊么，下不为例。
你好！
下不为例
Just this once
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