尽管这种几率非常非常小，但是不寻常事件发生的概率不会是零。
The risk is exceedingly small but the probability of something unusual happening is not zero.
我们知道我们的流程在活动a执行之前事实3发生的可能性和概率非常小。
Knowing our process we determined that the likelihood and probability of Fact 3 occurring before activity a is extremely low.
在小电流接地系统中，发生单相接地故障的概率很高，因而，准确的选出故障线路，对于提高运行可靠性，具有重要的意义。
Single phase earthed fault is the common fault in this system. To select the fault line accurately is of great importance to improve the operation reliability.
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