You must become our permanent customers as long as we have once cooperation.
我们只要有一次合作，您一定成为我永久的客户。
Once again, I would like to thank you for this party and for your kind cooperation.
再一次谢谢你们这一聚会以及你们的好意合作。
Thank you once again for your hospitality and cooperation.
再次感谢您的款待和合作。
Thank you once again for your hospitality and cooperation.
再次感谢您的款待和合作。
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