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。

youdao

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.

所以他直接进行了描述，他用的是困难和简单两词，他说的困难，意思就是概率很小，他说的简单，意思就是概率很大。

youdao

At first it might be counter-intuitive because we know the probability density at the nucleus is the greatest.

起初我们觉得这和直观感觉很不相符,因为我们知道在原子核,出的概率密度是最高的。

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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.

所以他直接进行了描述,他用的是困难和简单两词,他说的困难,意思就是概率很小,他说的简单,意思就是概率很大

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