求翻译：關於降價一事我很抱歉, 依據2015年全年度的銷售金額,經重新審核現在的價格已經是很優惠, 所以明年度的單價仍然維持不變,如果訂單量增加時, 我們可以再重新討論價格是什么意思？

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About price drops on things that I am sorry, based on 2015 year annual sales amount, to review current price is a special, so that the unit remains unchanged, if order quantity increases, we will be able to re-discuss price

I was sorry very much about the reduction incident that, rests on in 2015 the entire year the sales amount, after reviewed a decision the present price already was very the preferential benefit, therefore the duration of next year unit price will still maintain invariably, if time order volume incre

About the prices I'm sorry, according to 2015 annual sales amounts, review current prices are very favorable, so next year's price remains unchanged, if the order volume increases, we can again discuss the price

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