【中文版】

crr是信贷评级机构穆迪投资者服务公司对发行人的债项评级。该评级是对借款人偿还债务能力的评估，是对债券违约风险的判断。通常情况下，债券的信用评级越高，代表其偿债能力越强，违约风险越低。

穆迪投资者服务公司对借款人进行信用评级时，会考虑其财务状况、业务状况、行业前景、管理团队的能力和经验等因素。通过对这些因素的综合评估，穆迪投资者服务公司会为借款人提供一个信用评级，以表示其对借款人偿债能力的信心程度。

在债券市场中，crr评级对于投资者来说非常重要。投资者可以根据crr评级来评估债券的信用风险，并决定是否购买该债券。一般来说，crr评级越高的债券，其市场表现越好，价格波动也越小。

穆迪投资者服务公司的crr评级共有21个等级，从Ba1到B3，其中B1是最低的信用评级。在评级中，穆迪投资者服务公司还会对债券的违约风险进行预测，并为投资者提供相关的投资建议。

总的来说，crr是债券市场中的重要指标，是投资者评估债券信用风险的重要依据。

【英文版】

crr is the debt rating of the credit rating agency Moody's Investors Service. This rating is an assessment of the borrower's ability to repay its debts and a judgment of the risk of bond default. Typically, the higher the credit rating of a bond, the stronger its ability to repay its debts and the lower its risk of default.

When assessing the credit rating of a borrower, Moody's Investors Service considers factors such as the borrower's financial and business conditions, industry prospects, and the ability and experience of the management team. Through a comprehensive evaluation of these factors, Moody's Investors Service provides the borrower with a credit rating to indicate its level of confidence in the borrower's ability to repay its debts.

In the bond market, crr ratings are very important to investors. Investors can use crr ratings to assess the credit risk of bonds and decide whether or not to purchase the bonds. Generally, bonds with higher crr ratings have better market performance and smaller price fluctuations.

Moody's Investors Service's crr ratings have 21 levels, from Ba1 to B3, with B1 being the lowest credit rating. In the rating, Moody's Investors Service also predicts the risk of bond default and provides relevant investment recommendations for investors.

In summary, crr is an important indicator in the bond market and an important basis for investors to assess the credit risk of bonds.