To reveal one's true character or integrity in critical moments or under severe trials; to show one's genuine quality when put to the test.
在那个充满挑战的项目中，他表现出了非凡的韧性，真是烈火辨日，越是艰难越能显出真本色。
In that challenging project, he demonstrated extraordinary resilience, proving his true character when put to the test, just as one would discern genuine quality under intense scrutiny.
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