controversy over a purchase-and-sale agreement
...; contracts for purchase and marketing of the products 购销合同纠纷案件 controversy over a purchase-and-sale agreement 购销差价 differential between purchase and sale prices ..
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controversy over a purchase-and-sale agreement
关于买卖协议的争议
以上为机器翻译结果，长、整句建议使用 人工翻译 。