但是鉴于我们一直以来的贸易往来,也为了我们以后能更好的合作,我们报给你方最优惠的价格

翻译这话的意思 如下:
This is the best offer which constructed by our long term relationship and closely cooperation.

翻译这话的适当字面 如下:
As always, concerning our trading business long run transactions, also for our better future cooperation, we have quoted the following price to benefit you.

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