{"groundTruth": ["首当其冲"], "candidates": [["首当其冲", "落花流水", "不言而喻", "出其不意", "雪上加霜", "罪魁祸首", "冰清玉洁"]], "content": "而#idiom#的是反向ETF(inverseETF)，据如theProSharesShortFinancial(SEF)，这类ETF做空道琼斯美国金融指数(DowJonesU.S.FinancialsIndex)。", "realCount": 1}