如何完美表達書信中的「謝謝」

Thank you for one of the most memorable days of my trip.
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為了旅途中最值得留念的一天，謹向您表示感謝。
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Thank you for one of the most enjoyable visits we have had in many months.
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9 O/ n$ b8 I6 `在您處的參觀訪問，是我們幾個月中最愉快的一次。謹向您表示感謝。

6 q. x% d* T4 L4 y- R$ Z. }7 hThank you for one of the most memorable days of my trip.
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為了旅途中最值得留念的一天，謹向您表示感謝。

Thank you for doing so much to make my trip to New York interesting (pleasant)(resultful).

為了使我去紐約的旅遊有趣（愉快）（大有收穫），您做了許多事，特此致謝。

Thank you for contributing so much to the pleasure of our stay in ...
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* b* ~$ Z! z4 d% G9 k& ?) P5 K/ C  m感謝您為使我們在......的停留期間的愉快所作的許多努力。

8 y& {& e, A" X: qThank you so much for your generous hospitality.
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非常感謝您慷慨的款待。
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! j8 e1 P/ _  O" b2 ~/ yI hope something will bring you to New York soon so that I can reciprocate your kindness.
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希望不久您能有機會到紐約來，使我能答謝您的盛情。

$ S7 _; t$ V8 ^, t) R0 uYou must give me the chance to return your kindness when you visit here.

- v6 N' w2 ^( V+ A! v希望您光臨我處，使我能答謝您的盛情。

Thank you very much (ever so much) (most sincerely) (indeed) (from the bottom of my heart).

很（非常）（最真誠地）（確實）（衷心）感謝您。
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Many thanks for your kind and warm letter.

感謝您友好而熱情的來信。
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& p9 I+ i0 J* h" v" gThanks a million (ever so much).
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萬分（非常）感謝。
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0 W. `+ n. W  S+ j; e) M1 tPlease accept ( I wish to express )my sincere (grateful) (profound) appreciation for ...

請接受（致以）真摯的（衷心的）（深切的）感謝......
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" z1 z0 T1 y/ QI sincerely (deeply) (warmly) appreciate ...
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我真摯的（深深的）（熱情的）感謝......

- R# y0 y% k: {4 a. h7 c/ JI am very sincerely (most) (truly) grateful to you for ...
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為了......，我非常真摯的（深深的）（真誠的）感謝您。 (待續)

$ l% C* N6 L+ {4 g. _1 B3 ^There is nothing more important (satisfying) (gratifying) to me than to receive one of your letters.
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# o6 X0 E9 F, B1 `再也沒有比收到您的來信更使我覺得重要（快慰）（感激）了。
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Your letters are so much fun (comfort) (entertainment) (company).

您的來信充滿了樂趣（給了很大安慰）（帶來了歡樂）（使我不感寂寞）。
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; `1 W6 C* a' c8 E! v$ FYour most courteous (considerate)(delightful)letter...

您那彬彬有禮（體貼入微）（令人欣慰）的來信……

1 D% O5 u6 H% G' |7 B! `$ B$ U: s2 aI cannot tell you how much your letter delighted(relieved)(amused)(enchanted)me.

8 s0 R4 k7 w& i$ r我無法告訴您，您的來信使我多麼高興（寬慰）（覺得有趣）（陶醉）。

I love the way you say (put) things in your letters. You make even the smallest incident seem so interesting(important)
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(charming)(mysterious).
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我很欣賞您在信中描述各種事物的手法。您的妙筆使細小的事情都顯得很有趣（重要）（動人）（神秘）。

It was good (fine)(charming)(thoughtful)of you...
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承蒙好意（美意）（盛情）（關心）……

9 t9 D, y2 p/ T4 Y9 Q" vIt was nice(characteristically thoughtful) (more than kind) of you...

承蒙好意（特別關心）（十二分好意）……
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2 K: V6 F% R4 n7 W) jAt the outset, I want to thank you for your kindness to me and for your compliments.
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1 ], e! W& f' Q- Q0 y+ B首先，我要感謝您對我的友愛和問候。

Believe me, I am truly grateful for...
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) g- L! a; Q& w, H9 Z我確實真誠地感謝你……
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We were deeply touched by ...
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……使我們深受感動。

It is a hopeless(definite)(positive)understatement to say that I am deeply (sincerely)(truly)grateful.
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這就是說「我深深的（真摯的）（真誠的）感謝」遠不足以（不能確切）（不能明確）表達我的謝意。
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& g1 j) }5 ^/ X5 ]( |( ~, ~5 t; DIt』s generous of you to take so much interest in my work( to give me so much of your time) (to show me so much consideration).
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承蒙對我的工作如此操心（為我花費這麼多時間）（對我如此關懷）。
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& x1 u4 W$ N0 x0 z$ j; t9 p  G9 \We are indebted to you...
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我們感謝你……
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I regret very much that I did not have an opportunity to thank you personally for ...

未能面謝，深表遺憾。