否则退款用英语怎么说

退款在英语中可以用 "refund" 或 "return" 来表示。
"Refund" 来自拉丁文 "refundere"，意思是 "to give back, restore"。例如：
Can I get a refund for this defective product? (这个有缺陷的产品能退款吗？)
I would like to request a refund for my flight ticket. (我想要请求退还我的机票费用。)
"Return" 来自拉丁文 "revertere"，意思是 "to turn back, restore"。例如：
Can I return this shirt and get a different size? (我能把这件衬衫退回来换个尺码吗？)
I need to return this product because it doesn't work. (我需要退回这个产品，因为它不能正常使用。)
注意，"return" 还可以用来表示退回原处或归还，例如：
Can I return the book to the library now? (我现在能把这本书还回图书馆吗？)
Please return the pen to its original place when you're done. (请在使用完后把那支笔归还原处。)