如何完美表達書信中的「謝謝」

Thank you for one of the most memorable days of my trip.

為了旅途中最值得留念的一天，謹向您表示感謝。
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( U% e2 u* F! @, qThank you for one of the most enjoyable visits we have had in many months.
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6 n- {- z; H9 v+ X3 h$ U2 n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。
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Thank you for one of the most memorable days of my trip.
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+ O2 {  r) b5 a1 ?% L/ V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 doing so much to make my trip to New York interesting (pleasant)(resultful).
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+ Z( v4 U+ i: P) {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。
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) c. J9 g' i: r5 M* y+ k9 @Thank you for contributing so much to the pleasure of our stay in ...

3 E7 a( h  u* v0 w感謝您為使我們在......的停留期間的愉快所作的許多努力。
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Thank you so much for your generous hospitality.
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: G  Y  r8 M( k8 _+ n1 d4 N2 U非常感謝您慷慨的款待。

& D0 [# s" t3 H2 [7 n+ LI hope something will bring you to New York soon so that I can reciprocate your kindness.

希望不久您能有機會到紐約來，使我能答謝您的盛情。
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You must give me the chance to return your kindness when you visit here.

( ~! a' X% i3 [. w+ N2 y* G希望您光臨我處，使我能答謝您的盛情。
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( B- P8 S* j' ]: d/ E$ j, lThank you very much (ever so much) (most sincerely) (indeed) (from the bottom of my heart).

  B2 z3 n8 ^# d很（非常）（最真誠地）（確實）（衷心）感謝您。
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$ Y5 }0 |6 h( @6 W4 \Many thanks for your kind and warm letter.
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感謝您友好而熱情的來信。
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: [. ^+ @% n' \. ^) FThanks a million (ever so much).

萬分（非常）感謝。
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Please 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......

8 u; B( u! V0 D' cI sincerely (deeply) (warmly) appreciate ...

我真摯的（深深的）（熱情的）感謝......
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/ L# X7 u) L$ l; uI 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)
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There is nothing more important (satisfying) (gratifying) to me than to receive one of your letters.
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1 r; [; O" J7 n3 g. C7 ]4 z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).

: s/ i- _; x# r9 L* g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）。

4 d# G2 ]) W( f( ~, K8 K" \Your most courteous (considerate)(delightful)letter...
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7 B) K! `& r( g+ Y+ G4 ~' j- e% M您那彬彬有禮（體貼入微）（令人欣慰）的來信……
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# J3 ~$ b; k2 O4 B- a( z7 [) MI cannot tell you how much your letter delighted(relieved)(amused)(enchanted)me.

' c& _. h  l' W1 v6 Z  p  o5 }! b我無法告訴您，您的來信使我多麼高興（寬慰）（覺得有趣）（陶醉）。

2 b; X; o+ ~  |1 j8 Z! W6 a& {6 OI love the way you say (put) things in your letters. You make even the smallest incident seem so interesting(important)

(charming)(mysterious).

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...

' A9 G0 w6 Q& T$ c承蒙好意（美意）（盛情）（關心）……

It was nice(characteristically thoughtful) (more than kind) of you...

' f" c' W* c% U9 V, w+ [# U, H# `承蒙好意（特別關心）（十二分好意）……

At the outset, I want to thank you for your kindness to me and for your compliments.
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: C" d+ f! v& d" u  R- P( i首先，我要感謝您對我的友愛和問候。

% P5 S$ C0 p" G$ E3 w2 oBelieve me, I am truly grateful for...
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我確實真誠地感謝你……
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We were deeply touched by ...
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% |- h/ H( ~! G5 m……使我們深受感動。
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+ F; F- S$ |, T& K1 {' U* d+ U) IIt is a hopeless(definite)(positive)understatement to say that I am deeply (sincerely)(truly)grateful.

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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It』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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9 G! E3 [) Q2 U1 [1 h. o# {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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We are indebted to you...

我們感謝你……

I regret very much that I did not have an opportunity to thank you personally for ...
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0 y) z0 Z! b7 J未能面謝，深表遺憾。