Assuming the facts 1 and 2 do exist within the ProcessContext, activity a is going to execute and will produce fact 3.

假定事实1和2存在于ProcessContext中，活动A将执行并产生事实3。

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According to the formula above, when a process is started within a given ProcessContext, the first activity to be looked at is a, which depends on Facts 1 and 2 to exist before it is invoked.

按照上面的公式，当流程在给定的ProcessContext内开始时，第一个要考虑的活动是A，在它被调用之前依赖于事实1和2。

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