他们为债券发行实体以及特定的公司债券评定等级。从而给投资者一定的指导，让他们了解公司的信用等级，以及潜在的风险。
They assign ratings both to entities issuing bonds and to specific corporate bond issues. This gives investors a guide as to their credit quality, which indicates possible risks.
象研究股票和共同基金样研究债券对投资者来说是必要的，辨别债券等级将有助于识别违约风险。
It is important for investors to research a bond just as they would a stock or mutual fund. The bond rating will help in deciphering the default risk.
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