当事件发生时，与这个事件对应的对象发出信号，通知主循环事件已经发生。
When an event occurs, the object associated with that event emits a signal to inform the main loop that it has occurred.
不同于循环时间与不可逆时间，壮观时间是一种制造伪事件的积木。
Different from the circular time and the irreversible time, the spectacular time is a kind of toy bricks producing pseudo-events.
答：当流程中大多数步骤都顺序执行，而只有数量有限的循环或事件处理程序时，应该使用bpel流程。
Answer: You should use the BPEL process when most steps in the process are sequential, with only limited number of loops or event handlers.
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