当地村民在此开采煤炭的历史在300年以上。废旧煤洞的存在成为了工程的一大隐患,煤洞问题成为工程的主要地质问题之一。
Local villagers are mining for more than 300 years, so the abandoned and old coal mines are one of main geologic problems.
鸽子洞原理是分析数学组合的有力工具。但是其概念简单,可以通过以下具体的问题加以阐述。
The pigeonhole principle is a powerful tool used in combinatorial math. But the idea is simple and can be explained by the following peculiar problem.
如果仔细思考,这个问题中设置的例子,到底在那个洞上怎么回事。
If you look carefully and think hard about the example in the problem sets that is exactly what happens there.
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