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控制变量思想是一种重要的方法,灵活应用它可快速将复杂的问题简单化、深奥的问题通俗化,有利于提高我们分析问题、解决问题的能力.
The idea of controlling variables is an important method. The flexible application of it can quickly simplify complicated problems and populate esoteric problems, which helps to improve our ability to analyze and solve problems.