To be ignorant and unskilled, metaphorically like standing facing a wall with no view or understanding.
他总是固步自封，不肯学习新知识，以至于在专业领域显得墙面而立，毫无建树。
He always clings to old ways and refuses to learn new knowledge, to the extent that he appears ignorant and unskilled in his professional field, achieving nothing.
Era:
Ancient
Frequency:
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