1.Please accept our thanks for the trouble you have taken.
有劳贵方，不胜感激。
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2.We are obliged to thank you for your kind attention in this matter.
不胜感激贵方对此事的关照。
3.We tender you our sincere thanks for your generous treatment of us in this affair.
对贵方在此事中的慷慨之举，深表感谢。
4.Allow us to thank you for the kindness extended to us.
对贵方之盛情，不胜感谢。
5.We thank you for the special care you have given to the matter.
贵方对此悉心关照，不胜感激。
6.We should be grateful for your trial order.
如承试订货，不胜感激。(来源：世贸人才网)
