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We need to bring in an expert to deal with this problem. He's an expert on 15th-century Italian a...

He's an expert on 15th-century Italian art. Bomb disposal experts have defused a 110-pound bomb a...

Both on and in are correct. However, there is a slight detail in meaning to consider when actuall...

Expert on usually means someone is very knowledgeable about something, in this case digital camer...

海詞詞典,最權威的學習詞典,為您提供expert at的在線翻譯,expert at是什麼意思,expert at的真人發音,權威用法和精選例句等。