The probability is hard to calculate primarily because of the possibility of what are called common-cause accidents, where the loss of off-site power and of on-site power are caused by the same thing.

这个几率很难去计算的原因主要是因为发生所谓共发生事故的可能性，也就是说造成站外及站内电源掉线的是同一个原因。

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And the possibility of a meteorite isn't a joke: "it's there somewhere - it's just a very low probability," Corradini says.

有可能被流星砸中并非是一个笑话：“这确实可能—只是可能性很低而已，” Corradini说。

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The probability is hard to calculate primarily because of the possibility of what are called common-cause accidents, where the loss of off-site power and of on-site power are caused by the same thing.

发生此类事故的概率很难估计，因为发生由于同种因素导致核电站内外同时断电的概率难以计算。

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The possibility and probability of a gut-to-brain connection in autism.

FORBES: Anti-Vaccine Activists Apparently Immune To Science