Introduced a few key process model that flexible workflow such as: Random process, Backward process and their realizations.

最后介绍了柔性工作流的几个关键流程模式：自由流程、回退流程、取回流程及它们的实现。

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What if that same process could be run in reverse, like a movie run backward?

如果相同的过程逆向运行会怎样，像一部倒放的电影？

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In case of a backward jump, activities may be executed multiple times which also may have effects on the process.

对于向后跳转，可能多次执行活动，这也可能对进程有影响。

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Unfortunately, because of the nature of air circulation, any downward-pointing force created aerodynamically generates a backward-pointing resistance in the process just as an increase in the lift of an aircraft wing as the flaps are lowered for take-off or landing creates more drag in the process, forcing the pilot to open the engine throttles to overcome the extra wind resistance.

ECONOMIST: CAR DESIGN