词性是名词，例如：

1、One of the best defenders in the NBA explained how to effectively play man-to-man defence.美国职业篮球联赛（nba）的最佳后卫之一讲解了如何有效地使用盯防战术。

2、Jack: That's true. He has won five NBA championships and two Olympic gold medals.杰克：没错。他赢得了五次NBA总冠军和两枚奥运会金牌。