This function can implement account expiration and access hour restrictions.
这个函数可以实现帐号过期并访问时间限制。
Data access services: These services are responsible for authorization, restrictions and logging access to data.
数据访问服务：这些服务负责数据访问授权、限制和日志记录。
Such restrictions on access have a cost, however.
但是，这种准入限制有一个代价。
The use of passwords and access level restrictions.
限制使用的密码和访问级别。
Age restrictions may apply for access to certain facilities.
某些特定的娱乐设施具有年龄限制。
Restrictions on access can be applied both within an organization and to external users.
有关存取方面的限制，可适用于组织内或外部使用者。
Persons under these restrictions must not access the Site.
受到这些限制的人均不得接达网站。
Persons under these restrictions must not access the Site.
受到这些限制的人均不得接达网站。
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