表明信用评级是一种解决非对称信息问题的手段，这种手段平行于激励理论。
It is shown that credit rating is a way to solve the problem of asymmetric information, different from incentive theory.
关键的问题是这些密钥是非对称的；使用一个密钥加密的信息可以使用另一个密钥来解密。
The important point is that the keys are asymmetric; information encrypted with one key can be decrypted using the other key.
关键的问题是这些密钥是非对称的——使用一个密钥加密的信息可以使用另一个密钥来解密。
The important point is that the keys are asymmetric — information encrypted with one key can be decrypted using the other key.
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