范文：
Dear Mr. and Mrs. Smith,
I am now back to China safe and sound. In this letter I would like to convey my heartfelt thanks to you and your lovely children for your kindness and hospitality to host me when I was in New York. Your generous help and tender care made me feel warly welcomed and transformed my first American trip into a beautiful memory.
I do hope that your whole family pay a visit to China in future, so that I could have the opportunity to repay your friendship. I assure you that you would enjoy visiting here as I did at your home.
I feel obliged to thank you once more.
Love,
Li Ming
译文：
亲爱的史密斯先生和夫人：
我现在安全健康地回到了中国。通过这封信，我想表达我对于您二位和你们可爱的孩子们衷心的感谢，感谢您对我纽约之行的热情招待。你们的慷慨和对我的关心使我此行更加愉快，而我的第一次美国之行也因此变成了美好的回忆。
我非常希望你们能在将来访问中国，让我有机会回报你们的友谊，我保证你们会像我在纽约那样度过一个愉快的时光。
再一次向你们表示感谢。
爱你们的，
李明
闪光词汇及词组：
safe and sound: 安全健康
convey: v. 传达，转达
heartfelt: adj. 衷心的，真心实意的
generous: adj. 大方的，慷慨的
tender: adj. 温柔的
transform sth into sth: 把...变成 …
pay a visit: 访问
repay: 报答，偿还
万能句型：
In this letter I would like to convey my heartfelt thanks to…
Your generous help and tender care made me feel warly welcomed and transformed my first American trip into a beautiful memory.
I assure you that you would enjoy visitng here as I did at your home.
I feel obliged to thank you once more.
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