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Jyutping gam2 ze6 seon3
Pinyin gǎn xiè xìn

Definitions (Wiktionary)
  1. noun
    letter of thanks; thank you letter
Examples (Tatoeba—Mandarin-English)
  1. Mandarin
    我觉得你应该给他写一封感谢信。
    我覺得你應該給他寫一封感謝信。
    wǒ jué de nǐ yīng gāi gěi tā xiě yī fēng gǎn xiè xìn 。
    • I suggest that you should write him a thank-you letter.