He is a martial artist of great skill.
请问 of 在这里是什么使用方法。
如此的问题可以查词典解决的。譬如查《朗文当代高级英语词典》的of词条,其中的第15条使用方法为(例句和翻译也摘自该词典):
15. used to describe a person or thing by saying what their main qualities or features are(描写某人或某物所具备的主要品质或特点):
Albright was seen as a woman of great determination. 奥尔布赖特在大伙的眼里是一位很果断的女人。
Its an area of considerable historical interest. 那是个具备相当历史价值的区域。