To have a great reputation or title, but the actual ability or achievement does not match it; to be unworthy of one's fame or position; the reality does not live up to the name.
他虽然被誉为业界天才，但这次项目表现平平，真是名实难副啊。
Although he was hailed as an industry genius, his performance on this project was merely average, truly proving the saying that his reputation doesn't match his reality.
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