In other words, if middle - class Americans continue to struggle financially as the ultrawealthy grow ever wealthier , it will be increasingly difficult to maintain political support for the free flow of goods , survices , and capital across borders.

参考译文:换句话说,如果美国中产阶级继续在财政金融上奋力挣扎,而巨富们变得越来越富,那么,商品、服务和资本要想跨国境的自由流动将越来越
难取得政治上的支持。