你是因为什么原因降价就怎么写啊。
比如，原材料下调。
Dear Sir，
Glad to tell you a good news that we could reduce the price quoted XXX (报价日期) you because the raw material factory told us their cost descended 3% .
Hereby our company could give you the best special offer at XXX (价格) for our longterm business cooperation.
Thanks very much in advance and hope to get your order soon.
Best regards,
XXX
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