She is a professional card player who often competes in international tournaments.

card 的意思是"纸牌、扑克牌"。 player 是名词，来自动词 play（玩、游戏），指"玩游戏的人"或"运动员"。 card player 指"玩纸牌的人"，特指"扑克牌玩家"或"职业牌手"。