许多政客说希望形成一条无摩擦的边境，但梅和她的一些同事已在讨论要同时退出单一市场和关税联盟，即英国将位于有共同监管促进贸易的免关税区之外。
While many politicians say they want a frictionless border, May and some of her colleagues have discussed leaving both the single market and the customs union, thereby putting the UK outside the tariff-free zone in which trade is facilitated by shared regulations.