To appear substantial or well-fed but actually lack real talent or knowledge; to be superficially impressive but inwardly empty.
他虽然职位很高，但在专业领域却是个空腹便便的人，提不出什么建设性意见
Although he holds a high position, in his professional field, he is all show and no substance, unable to offer any constructive advice.
Era:
Ancient
Frequency:
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