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So it seems improbable at first that 23 people could produce 253 possible pairs.

所以23人就有253种配对组合看上去是不可能的。

Once our brains accept that, the birthday problem makes more sense.

一旦明白了这个道理，生日问题就变得合理了。

Every one of those 253 pairs is a chance for a birthday match.

253对组合中的人都能找到生日相同的另一半。

英语相关

For the same reason, in a group of 70 people, there are 2,415 possible pairs,

同样的，在70个人构成的小组中，组合数量能达到2415个，

and the probability that two people have the same birthday is more than 99.9%.

两个人拥有相同生日的概率超过了99.9%。

The birthday problem is just one example where math can show that things that seem impossible,

生日问题是一个很好的例子，展示出数学可以解释看起来不可能的事情，

like the same person winning the lottery twice, actually aren't unlikely at all.

例如同一个人中两次，不是几乎不可能的。

Sometimes coincidences aren't as coincidental as they seem.

有时巧合并没有看上去那么巧。