瞬间间隔是那些领域的短时间要素，如处于订货执行系统的一个订单。
Moment intervals are those elements of the domain that are transitory, such as an order in an order fulfillment system.
这个例子展示了如何以固定时间间隔获取一定数量的系统条件快照。
This example shows you how to take a fixed number of snapshots of some system condition at regular intervals.
对于每一次运行的测试，用户都会在一个正常的设置间隔内引入一个系统；这个时间间隔就叫做“间歇”阶段。
For each test run, users are introduced to the system at a normal set interval; this is called the "ramping" phase.
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