求翻译：配件成本需要下降只有一个方法，订单的单款产品数量在5000以上，这样配件的采购成本就会相对降低30-40%。 配件成本在原先报价增加 0.8美金-0.69美金是什么意思？

Parts costs need to fall only one way to order a single product number above 5000, such parts procurement costs will be relatively reduced by 30-40%. Accessories cost increase in the original offer of 0.8 $ -0.69 $

Parts need to lower costs is only one way, the order of the number one product in more than 5000 parts, so that the purchase cost will be relatively lower 30 - 40 per cent. Parts cost in the original quote US$0.8 - US$0.69

The fitting cost needs to drop only then a method, order form inscription consisting of signature only product quantity above 5000, such fitting purchase cost can reduce relatively 30-40%. The fitting cost is quoting price originally increases 0.8 dollars - 0.69 dollar

Accessories needed drop in costs is only one method, number of orders of products at more than 5,000, which accessory purchase costs would be relatively less 30-40%. Cost of accessories in the original quoted price increased $ 0.8-$ 0.69

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