The answer to this idiom is shrewdness.
Commentary: According to legend, Wang Xizhi wrote on the board, and when the carpenter carved, he found that the handwriting penetrated into the board for three minutes. Describe that calligraphy is very powerful. Nowadays, the problem of metaphor analysis is very profound.
From: Zhang Tang Huai Guan's Book Breaking Wang Xizhi: "Wang Xizhi's book is willing to be published, cut by workers, and the pen is incisive."
Example: When we read this poem, we have a particularly hearty feeling.
◎ Qin Mu's "Hands Not Stretched"
Grammar: formal; As predicate, attribute, adverbial and complement; Include praise