To neglect the fundamental issues and focus only on trivial details; to mistake the secondary for the primary; to abandon the essential for the trivial.
在学习新知识时，我们应该抓住核心概念，而不是抱枝拾叶，纠缠于细枝末节。
When learning new knowledge, we should grasp the core concepts, rather than holding a branch and picking leaves, getting entangled in minor details.
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