At least one of the incoming branches of the merge must come from outside the cyclic process fragment, or this process fragment could not be reached from other activities.

merge必须至少有一个传入分支来自循环流程片断的外部，否则将无法从其他活动到达此流程片断。

youdao

There's no change in them, and then we also looked at some at non-state functions, work and heat, and saw that those aren't zero going around a cycle. Of course you can do work in a cyclic process, and heat can be exchanged with the environment at the same time.

它们不会有变化，然后我们研究了,一些非态函数，功和热量，并看到,沿着循环行进一周的话,它们并不是零，当然你可以在,一个循环过程中做功，而同时热量可以在系统,与外界环境之间进行交换。

麻省理工公开课 - 热力学与动力学课程节选

Now you start a process, a cyclic process, where the first step in the process is denaturing the DNA.

然后你就可以开始一个循环步骤,第一步是使DNA变性

耶鲁公开课 - 生物医学工程探索课程节选

One of the reasons for this, as demonstrated in a recent paper by researchers at Yale medical school, is that when a person experiences extreme stress, or just goes through the normal process of aging, the prefrontal cortex accumulates cyclic-AMP.

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