偶一为之，汉语成语，拼音是ǒu yī wéi zhī，意思是指平常很少这样做，偶尔才做一次。出自《纵囚论》。
...后3分钟上场，然后一直挺到末段，这分明把老家伙(Old guy)当了24，而不是34，水淹脖子，急需赢球，可以偶一为之(Once in a while)，搞成常规战法，怕会要了老家伙一条性命。要不了多久，就可能会穿上西服，和板凳末端那哥俩胜利会师。
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也有吸烟者只是偶一为之但从不上钩。
Then there are "chippers," who smoke occasionally but never seem to get hooked.
他不是学者，学术性题材，只能偶一为之，且还得借助既成的成果。
He is not a learned man and can write but meagrely and at secondhand on learned subjects.
在翻译上，萧乾曾自谦说：“像我这样完全凭一时兴趣偶一为之的，翻译工作者也不配”。
In terms of translation, he modestly stated that, "I even could not match the title of'Worker on Translation', because I only translated several works with temporary interest."
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