If they're not, Britain could separate from the EU in what's called a No Deal Brexit but without an agreement in place, that could create some temporary instability for both Britain and the European Union.
如果解决不了,英国会在不签定协议的条件下离开欧盟,即所谓的" 无协议脱欧" ,但这可能会给双方带来短暂的动荡。