To act in a way that defeats one's purpose; to use a method that runs counter to one's objective.
如果学习方法不对，一味死记硬背，那简直是北辕适粤，再努力也收效甚微
If the learning method is incorrect, blindly memorizing, that's like driving north to reach Guangdong; no matter how much effort is put in, the results will be minimal.
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