letter of appreciation

• 感谢信

letter of appreciation的用法和样例：

例句

1. I received a gracious letter of acknowledgement.
   我收到一封有礼貌的感谢信。
2. My mom said I should send you a thank-you letter for the picture you sent me.
   我的母亲说我应该给您写封感谢信，感谢您送给我的照片。