不仅如此，曾一度成为工薪阶层白人高收入主要来源的制造业岗位在过去一代人间急剧下降，目前仅占劳动力总量的12 % 。
Moreover, manufacturing employment, once a prime source of high-paying jobs for working-class whites, has fallen sharply over the last generation, to just 12% of the workforce.