英语语法分析

The second class of problem comes from the world of combinatorics.

第二类问题来自组合数学界。

The pigeonhole principle is a important principle in combinatorics.

鸽巢原理是组合学中一个非常重要的原理。

So it's a different kind of combinatorics problem that results. So, OK.

那么结果是一类不同的组合问题,那么，好。