销售产品一经售出，将在一周内免费退换的服务，配件做到终生免费更换服务。
Sales of products once sold, will be returned within one week of service free, free replacement parts to achieve life-long service.
销售产品一经售出，将在一周内免费退换的服务，配件做到终生免费更换服务。
Sales of products once sold, will be returned within one week of service free, free replacement parts to achieve life-long service.
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