To describe a person who assumes a dignified appearance but lacks actual ability or substance, often used to mock those who gain influence or position through pretense or superficial means.
他虽然职位很高，每次发言都说得头头是道，可一到关键时刻就束手无策，真是木猴而冠。
Although he holds a high position and always speaks eloquently, he becomes helpless at critical moments; he is truly a monkey wearing a cap.
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