他发誓定期给朋友写信。

He made a vow to write to his friend regularly.

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He made a vow to write to his friend regularly.

vow 是名词,意思是"誓言、誓约",指郑重承诺要做某事或遵守某种行为准则。这个词常与宗教或正式承诺相关,表示严肃的保证。

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