此事当另函详陈。
The matter will be explained in detail in a separate letter.
另函中，我方已按贵方要求寄出各种品牌的样品目录表。
Under separate cover, we have sent you sample books of various brands as per your request.
另函中，我方已按贵方要求寄出各种品牌的样品目录表。
Under separate cover, we have sent you sample books of various brands as per your request.
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