We keep a reference sample of such special orders.
我方保存着这种特殊定货的一份样品。
The reference sample: see attached pictures.
参考样本：见附件图片。
We closely compared the sample you returned with our reference Sample.
我们把你方退回的样品同我方参考样品做了详细的比较。
We closely compared the sample you returned with our reference Sample.
我们把你方退回的样品同我方参考样品做了详细的比较。
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