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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3 f( C: I9 Y' J' Y- E; J# I* sThank you for one of the most enjoyable visits we have had in many months.
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- `/ K) i! X4 s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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! b' n4 P' d$ Y! yThank you for one of the most memorable days of my trip.

, M7 y( b5 F1 i: q% Y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。

" D8 s6 s% ~4 l6 q+ q, o& e- xThank you for contributing so much to the pleasure of our stay in ...

感謝您為使我們在......的停留期間的愉快所作的許多努力。

Thank you so much for your generous hospitality.
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1 X* C$ G: h8 _- ]; N" A非常感謝您慷慨的款待。
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I hope something will bring you to New York soon so that I can reciprocate your kindness.

3 i0 ^8 O+ b: `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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$ i. l3 D& |* h: H& j& E: Z" aYou must give me the chance to return your kindness when you visit here.

5 V0 q' M4 j4 ?+ m! `8 D* n' k- K& ^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).
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3 w, r; V3 R/ ]- D( P! r# h/ q很（非常）（最真誠地）（確實）（衷心）感謝您。

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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$ \) F/ e6 i. q4 a$ CThanks a million (ever so much).
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萬分（非常）感謝。

; m# a$ R: v+ s" IPlease accept ( I wish to express )my sincere (grateful) (profound) appreciation for ...
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( {% P' A+ v' S" i' ~" E1 g8 [請接受（致以）真摯的（衷心的）（深切的）感謝......

I sincerely (deeply) (warmly) appreciate ...
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我真摯的（深深的）（熱情的）感謝......
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I am very sincerely (most) (truly) grateful to you for ...
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$ F2 X! G2 j2 M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.

再也沒有比收到您的來信更使我覺得重要（快慰）（感激）了。

Your letters are so much fun (comfort) (entertainment) (company).
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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）。

$ }% q* x1 j+ o" j6 pYour most courteous (considerate)(delightful)letter...
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5 [7 R, Y3 {" n+ E' [1 U; d您那彬彬有禮（體貼入微）（令人欣慰）的來信……

I cannot tell you how much your letter delighted(relieved)(amused)(enchanted)me.
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7 B* ]8 T2 }1 h% f我無法告訴您，您的來信使我多麼高興（寬慰）（覺得有趣）（陶醉）。
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, o/ T; @& ~/ v$ JI love the way you say (put) things in your letters. You make even the smallest incident seem so interesting(important)

(charming)(mysterious).

1 B# a, ^7 c1 X+ e- l; R, @$ ^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）。
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It was good (fine)(charming)(thoughtful)of you...

3 v4 b, O$ T4 M2 |& p承蒙好意（美意）（盛情）（關心）……
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2 }! G5 B5 N/ ~! d# eIt 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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; d6 S6 u" J5 Q% {  O9 a+ lAt the outset, I want to thank you for your kindness to me and for your compliments.
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; h! U5 |! N% r# J9 E2 y1 I) W首先，我要感謝您對我的友愛和問候。
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4 {# n$ H' |+ T+ H* W5 X' ^6 J7 tBelieve me, I am truly grateful for...

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。
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0 l. W8 i# H3 a7 U# W# [- \- b, pIt 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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0 R$ D0 u% u( H2 JIt』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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$ Z; K* @: }$ X% c* C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）。

7 m& \& m6 ?2 s8 o9 yWe are indebted to you...

我們感謝你……

! ^* k& `7 p6 o# ~I regret very much that I did not have an opportunity to thank you personally for ...
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未能面謝，深表遺憾。