前面的有个an expert是指一个人,所以要加an
后面的expert的主语是children是复数,所以不需要加an
前面的expert是名词专家,后面跟的at在某个领域,指在某个领域是专家
第二个expert是和expert at连用在一起的,意思为擅长或精通
become an expert at 与become expert at 与
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