In order to understand probability, you have to take things as coming from a random event and people don't clearly have that in their mind from an intuitive standpoint.
为了理解概率，你要把事件想象成是随机发生的，但人们没有那样，清晰直观的认识。
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So, he's using intuitive — he says difficult or easy — so he says it's difficult, meaning the probability is very low, or easy, meaning that probability is high.