名词
中文翻译：Unknown
同义词：
['sample receipt', 'sample bill', 'sample invoice']
例句：
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1. We need to provide a sample invoice for the new product before we can proceed with the order.
在下单之前，我们需要提供新产品的样本发票。
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2. The company sent us a sample invoice as proof of payment.
公司向我们发送了一个样本发票作为付款证明。
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3. The customer requested a sample invoice to review the details before finalizing the purchase.
客户要求一个样本发票来审查细节后最终确定购买。