duty-free

形容词 duty-free:

1. exempt from duty

1. You're allowed 1 litres of spirits duty-free.
   你可免税带进1升烈性酒。
2. There's a good duty-free shop (ie one selling such goods) on the ferry.
   渡船上有个挺不错的免税商店。

du.ty-free

adj.（形容词）
Exempt from customs duties:
免税：免征各种关税的：
例句：
duty-free merchandise.
免税商品

Of, relating to, or being a region or establishment in which imported goods are exempt from customs duties:
免税的：可以对进口货物免征关税的地区或机构：
例句：
a duty-free port; a duty-free shop.
免税港；免税商店

【引伸】
du.ty-free.
adv.（副词）