double whammy
noun [ C usually singular ] informal uk/ˌdʌb.əl ˈwæm.i/ us/ˌdʌb.əl ˈwæm.i/
祸不单行
a situation when two unpleasant things happen at almost the same time
Farmers have faced the double whammy of a rising dollar and falling agricultural prices. 美元升值加上农产品价格下跌对农民而言可谓是双重打击。