When he plugged that wind-force equation into his model and assumed that the probability of a branch breaking due to wind stress is constant, he came up with Leonardo's rule.

他将风力公式应用到他的模型中，并假定树枝受到风力作用而断裂的概率是恒定不变的，据此他推导出了达·芬奇公式。

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If the probability of observing a car in 30 minutes on a highway is 0.95, what is the probability of observing a car in 10 minutes (assuming constant default probability)?

在公路上如果每30分钟开过一辆车的概率是0.95，那么在十分钟内开过一辆车的概率是多少(假设默认的概率不变)？

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For the third case, arc power is constant, arc discharge time and occurring probability is very small therefore causing no gas ignition.

第三种情况是电弧功率在整个放电时间内基本不变，放电时间小，出现概率很小，不会造成气体引爆。

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