rust belt
noun
often as modifier
- informal a part of a country considered to be characterized by declining industry, ageing factories, and a falling population, especially the American Midwest and NE states〈非正式〉锈带, 工业衰退地带（指工业衰退, 工厂老化和人口减少的地区, 尤指美国中西部和东北部各州）：
a rust-belt town.
一个工业衰退地带的城镇。