A sector of the US finance industry that looks after $4tn of savings for individuals and businesses has come under severe strain as US markets flirt with negative interest rates.
隨著美國金融市場在負利率邊緣徘徊，美國金融業一個爲個人和企業掌管4兆美元儲蓄的領域受到嚴重壓力。
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