名词
中文翻译：Unknown
同义词：
['purity certificate', 'proof of purity', 'certificate of authenticity']
例句：
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1. The company issued a certificate of purity to its customers to ensure their products were genuine.
公司向其客户提供了纯度证明，以确保其产品的真实性。
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2. The museum has a certificate of purity that lists all the materials used in its exhibits.
博物馆有一份纯度证明，列出了其展品中使用的所有材料。
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3. The manufacturer provided a certificate of purity for the product, which was widely recognized by consumers.
制造商为该产品提供了纯度证明，消费者普遍认可。