Talks between the United States and Canada failed late Friday to head off steep new tariffs on Canadian goods, prompting Canada to promise “dollar for dollar” retaliation. 美国与加拿大之间的谈判于周五晚间破裂，美国将对加拿大商品加征高额新关税，加拿大承诺将采取“等额”报复措施。 Prime Minister Mark Carney of…