professor Milliken,one of the world's leading experts on the evolution of insects,is scheduled to come to Beijing in July.after he stays here for a few days,i am to accompany him on a tour of Yunnan.为什么one of the world's lesding experts 为啥

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professor Milliken,one of the world's leading experts on the evolution of insects,is scheduled to come to Beijing in July.after he stays here for a few days,i am to accompany him on a tour of Yunnan.为什么one of the world's lesding experts 为啥错

语法上没错!
不过, 如果上文没有给出这个领域有哪些专家, 最好是：
a leading expert of the world


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好像没错啊

错在介词on.
expert in
expert at
是较为常见的两个短语。be expert in 意思是“某方面的专家”,而be expert at和be good at的意思一样，“擅长于...”
介词on不多见。顺便再次体会下三个介词的差异，at最小,on较大,in最大，或者另一种说法是，at点，on线，in面。拿时间来做个例子。at six（一个时刻点）...

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错在介词on.
expert in
expert at
是较为常见的两个短语。be expert in 意思是“某方面的专家”,而be expert at和be good at的意思一样，“擅长于...”
介词on不多见。顺便再次体会下三个介词的差异，at最小,on较大,in最大，或者另一种说法是，at点，on线，in面。拿时间来做个例子。at six（一个时刻点）, on Monday（具体某一天）,in March(月份，年等)。自己体会下。
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