The Federal Reserve is preparing to lift interest rates later this year, but many bond investors predict that chairwoman Janet Yellen will confront a puzzle that stumped one of her most famous predecessors.
美联储(fed)准备今年晚些时候加息，但许多债券投资者预测，美联储主席珍妮特•耶伦(Janet Yellen)将面临一个曾难倒她的一位最著名前任的难题。
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