购买国债就是认购国家借的债，即国家债券。它是国家为筹措资金而向投资者出具的书面借款凭证，承诺在一定的时期内按约定的条件，按期支付利息和到期归还本金。
日本央行从下周初开始还会用这笔资金购买国债。
The fund will also start purchasing government debt early next week.
由于投资者购买国债避险，近日美国利率已明显下跌。
American interest rates have fallen in recent days, as investors apparently seek refuge in Treasury bonds.
股市对预期的购买国债计划反应良好，因为美联储此举将降低利率。
Stocks had been reacting favorably to the expected program because a bond purchase by the Fed would drive interest rates lower.
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