免付运费

例句：

1. 1. We can choose to have our purchases delivered for free shipping.
   我们可以选择免费送货。
2. 2. The online store offers free shipping on all orders over $50.
   该在线商店对所有订单超过50美元的订单提供免费送货服务。
3. 3. Many retailers now offer free shipping as a promotional strategy.
   许多零售商现在提供免费送货作为促销策略。