标准普尔公司把债券的评级定为四等十二级：AAA、AA、A、BBB、BB、B、CCC、CC、C、DDD、DD、D。为了能更精确地反映出每个级别内部的细微差别，在每个级别上还可视情况不同加上"+"或"-"符号，以示区别。这样，又可组成几十个小的级别。投资级即为BBB。
因此收益率在2%的两年期银行定存单或者通货膨胀保值型国债，以及收益率在2%以上的短期投资级债券基金都属于不错的选择。
So a two-year bank CD or a Treasury inflation-protected security yielding around 2%, and short-term investment-grade bond funds at 2% plus, aren't the end of the world.
如果美国真的失去AAA级，那么一些只能持有AAA级债券的投资者就可能不得不卖出。
If America actually loses its AAA, some investors who are obliged to own only AAA-rated paper might have to sell.
投资者预计垃圾级欧洲企业的债券发行本周将出现井喷，在去年的大部分时间里，债券市场的这一领域都处于冻结状态。
Investors are expecting a spurt of issuance this week by junk-rated European companies, a sector of the bond market that was frozen for much of last year.
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