pigeonhole principle

基本解释

Now that we have a good grasp on the pigeonhole principle, let's see how it can be used.
现在我们对鸽子洞原理有了较好的理解，现在来是怎么运用的。
By the pigeonhole principle, the point is either connected to at least three other points or not connected to at least three other points.
根据鸽子洞原理，这个点要么至少与其它三个点相连，要么至少没有与其它三个点相连。
There are 27 words or “pigeons” that can start with one of the 26 different English letters or “pigeonholes.” By the pigeonhole principle, two of the words must start with the same letter.
假如27个单词能以26个不同的英文字母中的一个开头（类同于将27个”鸽子“”放入26个鸽子洞中），根据鸽子洞原理，必有2个单词以同一字母为首。