两者都是熟练的意思,skilful是美式英语,skillful是英式英语；
skilful：adj.技术好的;功夫深的;熟练的;制作精良的;处理巧妙的；
skillful：adj.灵巧的;擅长于 (at; in);制作精巧的
A smooth sea never made a skillful mariner.
风平浪静的海面练不出熟练的水手。
She was a skilful speaker who knew how to work a crowd.
她是个很有技巧的演讲者，善于感召听众。
Players as skilful as this are a rare breed.
如此有技巧的演奏者很少见。
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