be expert at和excel in的用法

be expert at和excel in的用法 be expert in与be expert at 的区别 be expert at与be good at,be expert in与be good in, be expert at doing 还是in doing an expert on和be expert in的区别 是be an expert in/at/on ,还是be expert in/at/on? 求翻译：她擅长画画 (be expert at) be expert at怎么用 举几个例句 i to want a be computer expert 连词成句 an expert in/at/on/with有什么区别?例子：1.an expert in/at teaching small children意思就是说an expert in和an expert at通用对吗?2.an expert in economics3.an expert on foreign affairs4.an expert with the needles be expert on in at有什么区别都可以用吗有什么区别 that's my life and experience every dayI usually think that I can anything I like.however,when I grow old,I find my limit.everyone is talented in only some special areas.some are excel in math,someare good at sports,some are expert at talking.that's I（be) at school 请随手关门 behind 让皮肤长时间晒太阳是有害的 expose 他擅长画画 be expert at 请随手关门 behind 让皮肤长时间晒太阳是有害的 expose 他擅长画画 be expert at I wanna be an expert on English,how I can do this?Is there anybody who can help meon this? expert at/on/in 有什么区别 expert和expert for的区别和意思