他记起一位朋友昔日的恩情，便写给他一封信表示感谢。
He remembered past kindness of a friend. And wrote him a thankyou letter.
他记起了曾经帮助过他的一个朋友，于是写了一封感谢信。
He remembered past kindness of a friend was so pleased with the thank-you letter.
例如，我向至今为止所有面试过我的招聘经理发送了感谢信，但是一位朋友称如果我寄给面试官一封手写信件，那么会给他们留下一个更加深刻的印象。
For example, I sent thank-you notes by email to the hiring managers I've met so far, but a friend says a handwritten note would have made me stand out more.
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