The server requires these resources on an on-demand basis for a much shorter period than the time span between t1 and t2, which is the total duration of the transaction from the client's perspective.
服务在短于 t1 到 t2 的间隔里以按需方式占用这些资源，而 t1 到 t2 的间隔是客户端方面的事务总持续时间。
From the human being's age and life span to research history is an influential perspective, but is neglected for a long time.
从人的年龄与寿命去关照历史是一个颇有意义的视角，但长期以来却被人们所忽视。
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