1.Please accept our thanks for the trouble you have taken.
有勞貴方，不勝感激。
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2.We are obliged to thank you for your kind attention in this matter.
不勝感激貴方對此事的關照。
3.We tender you our sincere thanks for your generous treatment of us in this affair.
對貴方在此事中的慷慨之舉，深表感謝。
4.Allow us to thank you for the kindness extended to us.
對貴方之盛情，不勝感謝。
5.We thank you for the special care you have given to the matter.
貴方對此悉心關照，不勝感激。
6.We should be grateful for your trial order.
如承試訂貨，不勝感激。(來源：世貿人才網)
