except for 除了...以外(与 except for 连用的整体词与 except for 所跟的词往往不是同类的,是指整体中除去 一个细节。)
eg:Your composition is good except for a few spelling mistakes.
除了几处拼写错误以外, 你的作文写得很好。
in addition to除...之外(还)【及物】
eg:In addition to French, he has to study Japanese.
除了法语外,他还得学日语。