名词
中文翻译：Unknown
同义词：
['reference number', 'reference id', 'reference code']
例句：
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1. Theletter reference number is crucial for the record-keeping process.
信函参考编号对于记录保存过程至关重要。
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2. The company uses a unique letter reference number to track its shipments.
该公司使用一个独特的信函参考编号来追踪其货物。
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3. The customer service representative assigned a letter reference number to each inquiry.
客户服务代表为每个询问分配了一个信函参考编号。