Timestamping a record is done many times throughout the life of a transaction for recording the time a transaction was created, was last modified, was last accessed, and so on.
在一个事务的整个生命周期内，需要多次记录时间戳，以便记下创建、最后一次修改、最后一次访问某一事务的时间。
Activity Trends provide information, such as the last time a user accessed the server, that you can use to keep track of accounts that are inactive (see figure 14).
Activity Trends提供了信息，比如用户访问服务器的最近时间，可以用于跟踪不活动的帐户(参见图14)。
Servlets use this interface to view and manipulate information about a session, such as the creation time and the last time the session was accessed.
Servlet使用该接口来查看与处理有关会话的信息，如创建时间和上一次访问会话的时间。
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