求翻译：要实现SSO的功能，让用户只登录一次，就必须让应用系统能够识别已经登录过的用户。应用系统应该能对ticket进行识别和提取，通过与认证系统的通讯，能自动判断当前用户是否登录过，从而完成单点登录的功能。是什么意思？

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Must realize the SSO function, lets the user only register one time, must let the application system could distinguish has already registered the user.The application system should be able to carry on the recognition and the extraction to ticket, through with the authentication system communication,

To enable SSO functionality that allows users to log on only once, must apply to recognize users who have logged on to the system. Applications should be able to identify and extract the ticket, through communications with the authentication system, is capable of automatically determining the curren

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