兑换的礼品不可退货或退换现金。

Gifts redeemed are non-returnable and cannot be exchanged for cash.

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分析了简单供应链系统在不可退货的限制条件下的动态性。

Dynamics of simple supply chain with constraint of no permitted order return was analyzed.

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该网站对定做鞋另外收取20%的费用，这些鞋在中国生产且不可退货。

The site charges a 20 percent premium for made-to-order shoes, which are assembled in China and are not returnable.

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