有一读者问： 有这样一个例句：
(1)John is not good in sports, but when it comes to English, he is the best in class.
be good in与be good at有何不同？
be good in...的意思只是“在……方面好”，再如：
(2)He is good in mathematics.
但如强调“精于，善于”则应用be good at，例：
(3)He is good at figures.
be good in与be good at
