Authentication statements asserts to the service provider that the principal did certainly authenticate with the identity provider at a particular time using a well-defined method of authentication.

验证语句在特定的时间使用一个良好定义的认证方法，可确定主体从事身份提供商的确定验证的服务提供商。

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Sometimes certain requirements or constraints on the access to the service itself — including authentication, integrity, and confidentiality requirements — are needed by a client run time.

客户机运行时有时需要某些对访问服务本身的要求或约束(包括身份验证、完整性和机密性要求)。

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Since most services are stateless, authentication would need to be performed each time a service is invoked — a very time-consuming process.

由于大多数服务是无状态的，所以每次调用服务的时候就需要执行验证——一个非常费时的过程。

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