non return rate

例句：

1. 1. The company's policy onnon-returnable items is clearly statedon their website.
   该公司关于不可退货商品的政策在其网站上明确列出。
2. 2. The non-returnable nature ofthe product means that it cannotbe returned once purchased.
   产品的不可退货性质意味着一旦购买就不能退货。
3. 3. The non-returnable rate for this item has increasedsignificantly since last year.
   这项商品的非退货率自去年以来显著上升。