an expert on .方面的专家
分析：这里的expert是名词,专家n.例如：He is an expert on physics.(他是物理学的专家)
be expert in 在.方面是内行的
分析：这里的expert是形容词,内行的、专家的adj.,例如：He is expert in physics.(他对物理学很内行).
an expert on和be expert in的区别
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