表达 “know something back to front” 的意思是 “对某件事情了如指掌，或对某个话题有深入的了解”。
例句
You’re an expert in computing. You know computers back to front.
你是计算机学方面的专家。你对电脑了如指掌。
She is fluent in five languages. She knows English back to front.
That’s Jerry’s favourite game. He knows it back to front.
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