It is inappropriate to ask for a doggy bag when you are a guest.

当你是个客人时，要一个打包袋是不合适的。

Food in a doggy bag is like a free meal ticket.

打包的食物就像一张免费餐券。

Would you like to take the rest home in a doggy bag?

你要不要把其他的用剩菜袋带回家呢？

OK. I think we need a doggy bag.

好的，看来我们得打包了。

Could I get a doggy bag, please?

可以麻烦帮我打包吗？