代金券在英文中可以称为 "voucher"。它的来源可能源自法语词汇 "bon"，意为 "单据、收据"。

例句：

I'm going to use my voucher to buy a new pair of shoes.

我打算用我的代金券去买一双新鞋。

The hotel offered us a voucher for a free meal as compensation for the noisy room.

旅馆给了我们一张免费餐的代金券，以弥补嘈杂的房间。

Can I use my voucher to pay for the whole meal or just part of it?

我可以用代金券支付整顿饭吗，还是只能支付部分？