be good at中间的good能否换成excellent?介词是否仍然用at?

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be good at中间的good能否换成excellent?
介词是否仍然用at?

可以
仍然用at
excellent 词根是excel
eg: He excels at figure skating.
He is excellent/good at figure skating.
但是excellent语气比good重．

be excellent at 在某...出色,
可以!

be good at 擅长
be weak at 不擅长于
be excellent at 在某...出色,
可以!

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