例如，我们希望在整个会话期间保存用户的帐号、名字、地址和其它信息，这样各种组件都能访问这些信息而无需从磁盘检索。
For example, we wanted to keep the user's account Numbers, name, address, and other information throughout the session so various components could access it without having to retrieve it from disk.
principal是一个惟一的实体，比如个人或者组的名字、帐号、社会安全号或者类似的惟一标识。
A principal is a unique entity such as the name of an individual or group, an account number, a social security number, or similar unique identifier.
Alibaba同时也将有过欺诈而被禁用帐号的供应商名字公示。
Alibaba also posts the names of suppliers who have been banned.
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