卡框及卡芯框上的长方形皮带孔对称并且平行，且有一定的弧度，卡芯框的背面装有卡片扣3。

Oblong leather-belt holes on the card frame and the card-core frame are symmetrical and parallel, and has certain radian; a back face of the card-core frame is provided with the card buckle 3.

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卡框及卡芯框上的长方形皮带孔对称并且平行，且有一定的弧度，卡芯框的背面装有卡片扣3。

Oblong leather-belt holes on the card frame and the card-core frame are symmetrical and parallel, and has certain radian; a back face of the card-core frame is provided with the card buckle 3.

youdao