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多球问题画起图来很麻烦,分析思考就更困难了,如何在纷繁的困惑中取得突破?现介绍两种最基本又最常用的方法.
The multi-ball problem is very troublesome. It is even more difficult to analyze and think. How to make breakthroughs in the confusion? Here are two basic and commonly used methods.