The interest rate on 10-year US Treasury bonds almost doubled in six months, rising from 2.26 per cent last December to 3.98 per cent in mid-June, before decreasing slightly in recent days. This sharp rise happened despite the Federal Reserve's quantitative easing policy aimed at lowering long-term rates by buying $300bn (€21bn, £18bn) of Treasuries and promising to buy more than $1,000bn of mortgage securities.
10年期美国国债利率在6个月内几乎翻了一番，从去年12月的2.26%升至今年6月中旬的3.98%，最近几日才略有下跌，尽管美联储(Fed)实行定量宽松政策，通过购买3000亿美元国债，并承诺购买逾1万亿美元抵押贷款证券，力求推低长期利率。
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