be expert at doing 还是in doing

be expert at doing 还是in doing be expert in与be expert at 的区别 be expert at与be good at,be expert in与be good in, 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和excel in的用法 be expert at怎么用 举几个例句 be expert on in at有什么区别都可以用吗有什么区别 造句 be good at doing sth at work ,be work doing 区别 用be good at doing造句 be good at doing sth 等于 be good at+do 还是doing be gifted at doing举两个例子 an expert on和be expert in的区别 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 expert at/on/in 有什么区别