免费增送样本 supply sample free of charge 免费赠送样品 free sample ..
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Quality: the sellers are to supply the Buyers with samples free of charge, and the quality of goods to be shipped should be about the equal to the sample on which an order is given.
在质量上：卖房应提供免费样品给买家，而且运送的货物质量应该与样品质量保持一致。
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