nonrefundable

例句：

1. 1. The policy states that any purchases made within the first 30 days are nonrefundable.
   该政策规定，任何在购买后的前30天内购买的商品都是不可退款的。
2. 2.The customer service representative assured me that all transactions were nonrefundable.
   客户服务代表向我保证，所有的交易都是不可退款的。
3. 3.Since the product is nonrefundable, we recommend purchasing it in advance to avoid disappointment.
   由于产品是不可退款的，我们建议提前购买以避免失望。