Experts state that the occurrence of the high temperature this week is rather rare, though not unprecedented.

专家表示，本周所出现的高温现象虽然不是史无前例，但也相当罕见。

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The state evolution of low-level controlled plant conduces to event occurrence, whenever high-level discrete event system controller issues corresponding control commands and makes decision.

下层受控对象的状态演化导致事件的发生，并由上层的离散事件系统控制器做出监督决策，发出相应的控制命令。

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Social structural tensions and flawed State systems are the principal cause of this massive occurrence of transgress, which in return constraints the operation of social control.

这是因为社会的结构性紧张以及一些存在缺陷的国家制度导致了拐卖妇女这一大规模越轨行为的发生，并制约着社会控制的运作。

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