His basketball-playing skills are well-known in school.

basketball-playing 是由名词 basketball 和动词 play 的现在分词 playing 组成的复合形容词，表示"打篮球的"。 skills 是名词 skill 的复数形式，skill 指"技能、技巧"。 basketball-playing skills 指"打篮球的技术/技巧"。