他的儿子理解迟钝。
在对立面之间类似的冲突只是削弱了理智和心灵，而正是这种迟钝阻碍了对问题的理解。
Similarly conflict between opposites only blunts the Mind-heart and it is this dullness that prevents the understanding of the problem.
理解力迟钝的人以为迟钝是知识的本质。
Understanding the dull people think slow is the essence of knowledge.
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